Acronix is one of the two current (and powerless) Elemental Masters of Time. He is the younger twin brother of Krux. Once a proud Elemental Master who helped win the Serpentine War, Acronix and his brother betrayed the Elemental Alliance due to them believing that their Elemental Power, Time, was the strongest and entitling them to rule Ninjago. In response, their former allies Ray and Maya, per Wu's orders, forged a set of weapons that absorbed the twins' element. Acronix and Krux were lost in the temporal vortex, but Krux managed to escape and planned on how they would rule Ninjago by using the Vermillion as foot soldiers and the Time Blades to go back in time to defeat their former allies.
For four decades, Acronix remained in the temporal vortex and didn't age during that time. Upon his return at the Monastery of Spinjitzu, he was confronted by Wu, who had been waiting for him. Acronix was swiftly beaten by Wu, but by using the Forward Time Blade, Wu began to rapidly age. Acronix reunited with his brother, who had bred an army of Vermillion snakes since his escape. After capturing Cyrus Borg, they began building a time-traveling weapon, the Iron Doom, so they can travel into the past and give themselves a better future. Despite his brother's animosity towards technology, Acronix greatly enjoyed it, even gotten a BorgPad and BorgWatch. The twins disagree constantly about technology, but nevertheless love each other and strove towards their goal together.
Without a master to guide them, the ninja fought against Acronix and Krux numerous times but were unable to gain the upper hand. Ultimately, the Iron Doom was completed, and Acronix traveled back in time to defeat the Elemental Masters. Kai and Nya made a final effort to thwart their plans by aiding the Elemental Masters. When the Iron Doom tried traveling into the future, Wu removed the Reversal Time Blade from the weapon, causing it to spiral out of control. Though Kai and Nya escaped, Acronix was lost in the Temporal Vortex along with his brother and their greatest enemy.
Acronix was born 3 minutes after Krux. They were both descendants of the original Elemental Master of Time and had been raised by their mother. At some point in his life, he learned about the Destiny's Bounty. Eventually he and Krux discovered they were the current Elemental Masters of Time.
While Krux could go back in Time and pause Time, Acronix could go forward in Time to avoid opponents and attack them from behind and slow down Time to slow down attacks and move away from the line of fire. Although Acronix used these powers to great advantage, he was still a very skilled warrior without them; one of the best Wu has ever seen.
To achieve some form of victory in his downfall, Master Chen had his right-hand man, Clouse, use his Dark Magic to manipulate Krux and Acronix into betraying the Elemental Alliance, and Chen informed the twins of the location of the Great Devourer's eggs.
Knowing that they were more powerful than the other Elemental Masters, Krux and Acronix decided to betray the alliance and use their powers to control all of Ninjago. The other Elemental Masters fought against the Time Twin, but the two proved too powerful. During this, he fought Ray and Maya. When they try to blast him with Fire and Water, he went forward in time and attack Ray from behind and slowed down Ray's fireball to move away from it. After he and Krux finished the battle, they recite their signature motto to the Elemental Alliance; "Control Time, control everything." 
With the Time Blades made from Chronosteel forged by Ray and Maya, Wu and Garmadon fought a lengthy battle against the Time Twins at the Monastery of Spinjitzu. Eventually, Krux and Acronix tried to blast Wu and Garmadon with their powers, but their Elemental Powers were absorbed into the Time Blades, rendering them normal men.
Aware that the power to control time was too dangerous, Wu and Garmadon used te Time Blades to open a temporal vortex that would leave the Time Blades lost forever. However, Acronix and Krux decided to go through the temporal vortex themselves, which left the two "lost to time." Acronix would be lost in the temporal vortex for the next forty years. However, unbeknownst to the Elemental Alliance, Krux was somehow immediately teleported back to Ninjago and experienced a vision of the future, foretelling of Acronix's return.
Falling asleep at home following his battle with Clouse, Wu was stricken by a horrible nightmare filled with several visions of the past and future, such as the return of Acronix and Krux.
Four decades after the monastery battle, Acronix emerges from the temporal vortex at the ruins of the old monastery just as he was when he went into the temporal vortex. Upon arriving, however, he is unexpectedly confronted by Master Wu, who intends to finish their battle once and for all. As Wu tells Acronix that he's right on time, Acronix is surprised to see how old Wu has become, saying his best days have passed, not unlike his monastery. As Wu tells Acronix that he still has plenty of days left, he asks him that if they should finish what they started, saying that he's been waiting decades. As Acronix remarks that it hasn't felt that long to him, and is hiding a dagger behind his back, Wu states that it ends now.
Acronix and Wu circle around the center plant in the courtyard, with Acronix telling Wu to give up, saying his brother wasn't here to bail him out, but Wu tells him that neither is his. Acronix asks whose fault that was, and Wu tells him that he and Garmadon did what they had to do in order to protect Ninjago. Acronix then says he will do he must do. He pulls out his dagger and engaging Wu in a fight. Wu manages to knock him back with his staff into a pole and tried to hit him with his again, but Acronix dodges it. Acronix climbs up the pole and as Wu is about to jump towards him, he cut a piece off of Wu's staff. Admitting that Wu was sprier than he imagined, he asked if he could catch up. Wu then climbed up after Acronix and manages to block Acronix's dagger from hitting him.
Acronix climbs up after the tower of the monastery after Wu, telling him to once again give up, saying he has decades on him, saying he's both faster and stronger. Wu tells him that that's his mistake, saying that he thinks his youth is a greater weapon than Wu's experience. Acronix jumps after Wu and Wu nearly falls backward off the roof and down the cliffside but catches himself. Acronix jumps again and Wu dodges it. Telling him that he's arrogant to the finish as his brother, Acronix tells him it's confidence before struggling with Wu before Wu kicks him over him, where he lands on the edge of the roof. Acronix drops his dagger, he nearly falls to his death, but his cape was caught by Wu. Saying it was arrogance, he tells him that it was his brother's downfall and it would soon be his. Wu asked him if he yields, Acronix refused, but Wu told him there's no escape this time before letting go of him and quickly catching him again. Asking him again if he yields, Acronix then yields. Wu starts to pull him up, he explained that the battle forty years ago between them and the Elemental Alliance finally ended at exactly 6:00 pm. His watch striked 6:00 p.m, another temporal vortex opens above the monastery, where the Forward Time Blade soon lands in the courtyard, sending out a shockwave that spread across Ninjago, causing all time to skip a minute as Wu and Acronix "teleport" right next to the Blade and causes time to skip a minute, ultimately saving him. He claimed the Forward Time Blade from the ground, and snaged Wu's pocketwatch and exclaimed that at 6:01, the battle continued again.
Acronix begins to slowly overpower Wu, taunting him to flee. Calling him weak and afraid, he told Wu he has no ambition. Wu told Acronix that his only ambition was to rule, with he replied that he and his brother deserved to. Acronix asks Wu if he remember what he and Krux said 40 years ago. Wu recites the Time Twins' signature motto; "Control Time, control everything", Acronix resumes fighting, and in the midst of their fight, he was able to use the Forward Time Blade's powers to jump forward in time. After appearing again, he strikes Wu with the Time Blade, unleashing the Time Blade's power onto Wu.
Wu got up from the rubble, he then proceeded to name his newfound ability as the Time Punch, saying its effects are devastating. As Wu realized his mistake, Acronix tells him he never should've fought him, not forty years prior, or even today. Seeing that Wu was one more Time Punch away from death, he attempted to strike him, but Wu dodged the attack before using Spinjitzu to knock Acronix onto the roof, where he dropped the Time Blade. As he went for it, Wu appears and struggles with him, but Acronix soon kicked him over the side of the mountain. Wu managed to grab ahold of a lone branch. Acronix told Wu "You know what they say. If the Time Punch doesn't get you, the fall will", only to quietly admit no one actually says that, but they should.
After Acronix left him to die, the ninja arrived on the Destiny's Bounty He questioned why a two-century-old flying ship was doing here and now, remarking it has been a strange day. Jay goes down to confront him, asking if he saw Wu. He lied, claiming he doesn't know who he was talking about, but Jay saw right through the lie and pulled out his nunchucks. P.I.X.A.L. and Zane quickly identified him, forcing the ninja to help Jay fight him. A long fight ensued, and in the midst of it. Kai tries to hit Acronix with Fire, but he dodged it and set fire to the monastery. Acronix revealed to Kai that he had met his father. He teleported to on top of the monastery and teasing them into fighting him. While Zane and Nya attempt to put out the fire, the others who were fighting Acronix were able to sent their powers towards the Time Blade, overloading it and seemingly destroying both Acronix and the Time Blade, indirectly faking his death. However, Acronix used the Time Blade to escape to the stairs outside the monastery and starts going down them.
At midnight, Acronix made to the Ninjago Museum of History, with "Dr. Saunders" was waiting for him, asking him what took so long. Acronix apologized, explaining that he had ninja trouble. He admitted things had changed since he was last in Ninjago, "Dr. Saunders" took off his disguise, revealing to be Krux. The two brothers hug in front of the painting. Krux agreed things had changed before affectionately calls him "Brother".
Prior to The Hatching
Acronix went to the museum's gift shop and got a BorgPad. He occasionally uses his BorgPad later on; such as playing music, taking pictures, or playing games on it. Presumably, this kick-started his love for technology.
Now reunited, they were beginning their plan to rule Ninjago for all of Time and their revenge on Wu and the Elemental Alliance. Acronix became absolutely amazed by Ninjago's new technological advancements while his brother was becoming extremely annoyed by his growing fondness for the modern inventions that he never got to experience beforehand. He watches Borg's commercial for the new BorgWatch on Krux's wall mounted TV, mistaking both for "a wall mounted window for displaying thirty-second dramas". Krux turned off the TV and having to explain to Acronix what commercials were: "Cynical films playing off of consumers' insecurities to convince them to purchase that which they do not need". Acronix simply shrug and thought it was cool.
He admits to Krux he's jealous that he was able to experience forty years of progress and began messing with several gadgets in Krux's lab out of amazement. Acronix express amazement to "hot beverages at the touch of a button, a beadless abacus, and instant communication", (coffee machines, calculators, and cellphones), but Krux deemed them all worthless. He shows Krux the BorgPad from the museum gift shop and was amazed by the tablet's features. He played some music, (which was too loud for Krux), took a "permanent visual record" (picture) of Krux, (making Krux attempt to hide his face), and found some games. He got distracted by a candy-smashing game when Krux tries to explain to him why he hates technology.
Later on, Acronix switches to a fruit-slicing game. Krux eventually takes his BorgPad away to show him a helmet identical to the ones the twins wore during the Serpentine War. Acronix asks him what it's for. Krux explains they will able to return Ninjago to its "pre-modern glory". Arconix claimed he liked the idea and tried to wear the helmet before Krux explained the helmet's not for them. Krux introduced his brother to what he was working on for the past four decades since their defeat—raising Vermillion warriors from the eggs of the Great Devourer.
Watching from a tall building, Acronix asks what is happening. Krux told him the man in the brown jumpsuit was trying to defeat the Vermillion Warrior but was failing. He told Krux he meant Cyrus Borg and that the Vermillion was suppose to kidnap him. Krux told him to be patient, bu Acronix pointed out it was like Krux ordered him to destroy the Borg Store first, then grab Borg. It takes a second for Acronix to realize that's what Krux wants, much to his annoyance. When the Vermillion Warrior sent by the twins wrecked Borg's shop, the ninja came to help. The twins sent two more warriors. Zane tried to escaped with Borg, but Krux intercepts them disguised as Dr. Saunders while Acronix deactivated Zane with the Forward Time Blade. Both Acronix and Krux escape to their hideout in the museum with Borg.
Acronix remarked that they lost much of the soldiers' armor in the conflict. Krux assures him that he has his best blacksmiths working on creating more. Acronix asks if they'll be able to make enough for all the Vermillion snakes, and Krux says that he has bigger plans. He opens a door that heads deep into the sewers, leading to an underground nest of Vermillion snakes and eggs.
After the Vermillion warriors kidnap Borg and locked him in the coffin, Acronix questions how they will get the warriors to listen to them. Krux introduces Commander Blunck, Commander Raggmunk, and Commander Machia to him and tells his brother that they will command the Vermillion for them, and they have begun planning Phase II of their plan. Blunck try to explain the attack they outlined but Raggmunk interrupts him and began hissing at each other. Acronix sarcastically question Krux about the commanders being hand selected. Krux tells him they're fighters and requires them to have a certain amount of aggression. Acronix slams the table and orders them to reveal their plan. They began fighting again until Macia steps in and tells them to eithehey they tell the twins the plan or she will eat them for breakfast, bones and all, disturbing Acronix.
A while later, they were about to put the plan into action, but Kai went into the museum to find Dr. Saunders and got spotted by a Vermillion Sentry, who informed Raggmunk that Kai had arrived at the museum. Acronix realized they need to monitor Kai, but he (sarcastically yet accurately) guessed Krux didn't installed a security camera in the museum, even calling him "Mr. I-Hate-All-Technology-Even-Though-It's-Cool". Krux showed him a telescope that he had built into a snake statue. Noticing that Kai had taken a Vermillion helmet, Acronix fear that Kai was onto their plan and insisted that he neutralize him. Knowing that it would draw too much attention, Krux declared that he would attend to the matter himself and ordered the Vermillion commanders to commence Phase II of the plan.
After the Vermillion launched Phase II, Kai accidentally opened Krux's lab. Acronix went to the entrance, telling Krux said he was suppose to take care of the situation, which Krux said he was. He wanted to give Kai the "Time Punch" but failed when Kai got off of the chair that controlled the entry in Krux's Lab, causing the door to shut in front of Acronix's eyes. Later, Kai discovered that Saunders is Krux and battled him. Kai hit the Serpentine Statue, which unbeknownst to him, Krux installed a periscope which hit Acronix in his eyes. Acronix, now angry that he didn't finish Kai of in the Monastery when he had the chance, went to help his brother, only for Kai to push Krux onto the golden sarcophagus, which blocked the passageway and trapped Acronix in Krux's Lab. Krux tried to summon Acronix, but he wasn't able to reach him with the coffin in the way.
Eventually, Acronix blasted the coffin out with the "Time Punch" and came out to help his brother against Kai. Krux mused that Kai had met his twin brother. Kai pointed out that for twins, one of them looks much older. Acronix (jokingly, yet truthfully) reveals Krux was born three minutes earlier than him.
The Hands of Time had gained the upper hand, but Nya came and helped Kai battle against them. Kai and Nya locked Krux in the coffin which Borg was formerly trapped in (until Kai pushed Krux into the coffin earlier in the battle), helping them gain the upper hand. Acronix grabbed the Forward Time Blade along with Borg and used it to send himself, Borg, and Krux; who's still in the coffin, forward in Time, allowing them to escape.
Prior to Scavengers
At some point, Acronix gained possession of a BorgWatch and began wearing it on his left wrist, instantly becoming his favorite piece of technology. He also added a MP3 player and green earphones to his attire.
Acronix was with Krux in the sewers of Ninjago City, leading their Vermillion forces to their base, though it seemed they have become lost. Though Acronix tried to convince Krux to "get with the times" and tells him his new BorgWatch has a built-in GPS, he stopped short in his explanation upon realizing he had no service. Krux told him that's why he doesn't get with the times, saying that the old ways were still superior. However, Krux lead the group to a dead end, squishing them. Acronix said he hoped things were going better top side than in the sewers. Eventually, he and Krux were able find their base.
At the Vermillion Swamps, Acronix enters Krux's room, telling him that everything was going to plan, including the construction of the snake mech, as well as their "labors" being hard at work on their various projects before asking how things were going with Borg. Krux told him that it was going poorly, saying he has made little to no progress with the Time Apparatus. Borg tried to make an excuse as to why, but Krux tells him that in his time they built with anything they had and that craftsmanship meant something before accusing him of not wanting to make the apparatus. While Borg stated that they can't make him, Machia arrived, having been called to the base by Krux to "motivate" Borg. Machia begins to torture Borg with threats the snakes on her head, making Acronix slightly coward behind Krux. Once she finished, Acronix tells Krux that he likes her because of how mean she is. Krux teasingly suggests he has a crush on her, which Acronix naturally rejects. He admits to him that he considers her cute on the surface, but deep down she's a pile of snakes. Simultaneously, time slowed down briefly due to the arrival of the Slow-Mo Time Blade.
Krux said it had arrived, Acronix starts to use his BorgWatch, which angers Krux. Acronix explained he was trying to use his BorgWatch to uncover the Blade's location, but his brother was distracting him. Krux told him he puts far too much faith in technology and that his "smart"watch doesn't seem all that smart, causing Borg to reveal that the BorgWatch has things such as a heart rate monitor, a GPS unit and a temporal anomaly locator, which Acronix used to locate the Blade at the coordinates 34 degrees latitude and 28 degrees longitude. Defeated, Krux relunctantly admits that technology might have its uses sometimes. Machia identified the coordinates as the Eastern Sea of Sand, and reluctantly said both the Vermillion forces at Mega Monster Amusement Park and the scrapyard were in the best position of retrieving it. Kris said that the Blade was now their top priority, he ordered Machia to inform Blunk and Raggmunk of the changes of plans.
However, despite originally obtaining the Blade, the ninja stole it from them with the help of Jay's new Lightning Bike. With the mission failed, Blunk and Raggmunk make an excuse to Machia, saying the Moon was in their eyes. Though Acronix and Krux were initially happy, Machia then tells the Hands of Time they failed as she predicted, enraging Krux, asking that they didn't get the Blade. However, Machia reassured him that they will have it soon, using Acronix's temporal anomaly locator to track the Blade in the ninja's possession.
Once Blunk and Raggmunk returned to base, the twins angrily berated the two for their failure, saying they lost it to a bunch of kids. While explaining that it was the Blue Ninja who used his bike, they revealed they used the Time Blade, which they were not given permission to do, with the Hands of Time saying that if they knew how to use it, they wouldn't have lost it. While claiming that they didn't use it, Acronix berated them for losing the Time Blade, using the Time Blade, and lying about using and losing the Time Blade. The two tried to reassure The Hands of Time, saying they devised a plan which involved trading the Time Blade with the ninja in exchange for returning Cyrus Borg, but then double-cross them and take the Blade from themselves. Krux then told them that by doing that, the ninja would learn the location of their base, see their master plan, and try to take the Forward Time Blade. He goes on to tell them that they need all the Time Blades, including the one they lost. Once Machia was done threatening Borg for trying to sabotage the Time Apparatus, Blunk tries to come up with another plan involving chocolate ice cream, but she interrupts by saying they need a plan which will work, which gets Acronix's attention. By using Acronix's temporal anomaly, which Borg quietly admits to regret adding that, locator on his BorgWatch, they know of the Blade's location, saying all they need to do is go and get it.
Discovering the Blade was at the ninja's new HQ at the Temple of Airjitzu, the Vermillion warriors, along with Acronix, Krux, Blunk, Raggmunk, and Machia began their assault by catapulting a Vermillion egg into the temple, which alerts the ninja of their presence. After launching more eggs up to the temple and the ninja use Spinjitzu and easily defeat them, Blunk told Acronix that having Machia in charge was a bad idea, but she reassured them that it was only the first salvo and that next they send in "the big boy," using them remaining snakes and armor up at the temple to create a Buffmillion warrior, which the ninja barely succeed in defeating. The Vermillion then bombard the Destiny's Bounty, causing it to fall down to the ground below. Machia then orders a full-on assault, saying not to stop until the mission is complete.
Eventually, Lloyd went down to the Vermillion launch site and demolished some of their weaponry, including a Vermillion egg full of swords, which came down next to the commanders but they moved a few steps so the swords don't hit them. Machia then ordered the sky team to go in, ultimately succeeding in causing Lloyd to lose control of his dragon, but he is saved by the arrival of the new Samurai X. The Hands of Time ask what is taking so long, Machia assures them that it was only a minor setback.
With that, Acronix and Krux, now armed with the Forward Time Blade, personally attacked the temple themselves, using two Vermillion jetpacks to reach the temple grounds. As Cole, Nya, Zane and Lloyd charge towards the two, Acronix and Krux held hands as Acronix uses the Forward Time Blade to teleport the two of them directly to Kai and Master Wu, punching both of them down to the ground. Acronix went after the weakened Wu with the Forward Time Blade, but Cole threw Wu the Slow-Mo Time Blade, which he used to defend himself. As Acronix told him that his luck is about to run out, Wu used the Slow-Mo Time Blade on Acronix, which caused him to slow down. With that opportunity, Wu striked the Forward Time Blade out of Acronix's hand and onto the ground, where Krux obtained it. Kai battled him with the Slow-Mo Time Blade, Acronix was free of the Slow-Mo Time Blade's time bubble effect, where he claimed a discarded sword and tried to help his brother, but is stopped by Jay and Lloyd. As Acronix mocked Lloyd for trying to be a big, brave hero, Lloyd told him that underestimating his fighting skills was a mistake, but Acronix mocked him further for falling off his dragon. Acronix then attacked the two with his sword and nearly hit Lloyd, but he ducks out of the way.
As the fight continued and the ninja soon disposed of the arrival of Vermillion reinforcements, Cole ground pounds the ground, sending a shockwave that knocks everyone down. Now in a similar predicament, they were in forty years ago during their battle with the Elemental Masters in the forest, Acronix and Krux picked up Lloyd by his feet and swing him around, knocking down the others before throwing him to the ground. While Jay fought Acronix, Kai threw Lloyd the Slow-Mo Time Blade, who used it to battle Krux. The two locked Time Blades, releasing Time energy. Lloyd managed to swing Krux around, launching him into his brother and dropping the Forward Time Blade, which Cole catched and gave it to Lloyd. As the ninja celebrate, Machia arrived and swiped both Time Blades from Lloyd, landing next to The Hands of Time. Machia then slowed down the ninja with the Slow-Mo Time Blade. Telling the two that the Time Blades belonged to them, Acronix ordered Wu to be captured as Machia's airship arrived. As the four board, Acronix says they are wasting precious time before the ship flees the area with Krux, Acronix, Machia, both Time Blades, and Wu all safely on board.
Now armed with both Time Blades, Acronix and Krux lead the Vermillion warriors back to base. The two then begin to taunt Wu, suggesting he's gone deaf with old age. Wu tells them that he can hear every one of their attempts at humor, but Acronix and Krux laughed it off as they continue onward. Krux then calls for Blunk and Raggmunk, told them that he and his brother have been concerned for the leadership of the Vermillion warriors, saying that their mission didn't go quite as planned. The two general thought Machia would be in trouble, but Acronix told Machia that he and Krux were impressed with her actions, ultimately promoting her to the Supreme Commander of the Vermillion while demoting Blunk and Raggmunk to order under her, angering Blunk and Raggmunk, but Machia put them in their place. Wu then asks them if all of this promotion was premature, saying his ninja was still out there, but as they arrive at the Vermillon Swamps, Acronix told him that they had no master, no Time Blades and certainly no chance. Acronix taunted Wu by saying he almost felt sorry for them, the group laughs excluding Wu.
Acronix begins to use his BorgWatch, irking Krux. Acronix tells him he was sharing this victory with his Instabook followers, texting in that he has "achieved total victory". Krux angerly asked Acronix why does he have to ruin every good moment with his "modern techno-garbage", Acronix got annoyed and asked Krux why he was so stubborn about living in the ancient past before they head into the swamp. No one noticed a pair of red eyes watches them head-on.
Before the ninja moved out to go search for answers, Misako revealed that during Wu and Acronix's battle at the monastery, Acronix struck him with a punch powered by the Forward Time Blade, explaining that the Blade unleashed the forward energy of time onto Wu.
At the swamp, Acronix presents the Forward Time Blade to Cyrus Borg for the apparatus, but he claims he is not ready before Krux remarks that the disabled inventor released three upgrades to the BorgPad in one year as Machia threatened him with the Slow-Mo Time Blade.
During one of Wu's hallucinations, Acronix and Krux arrive as one of Wu's many mistakes, with Acronix telling Wu should have never came all by himself.
While Krux talked with Borg once the time apparatus is completed, Acronix arrived with Machia, saying the third Time Blade is about to arrive. Krux then took the Slow-Mo Time Blade from the apparatus and left with Acronix, Machia and Cyrus Borg to retrieve the third Time Blade. Traveling to the Glacier Barrens, Krux questioned Acronix on the Blade, Acronix said it was about to arrive in just a moment. On cue, the temporal vortex opens in the sky above, releasing the Pause Time Blade. After it landed, Time was paused. Once its effects wore off, Krux claimed the Blade and Acronix told him that the BorgWatch worked perfectly. He then tried to get Krux to admit that not all modern technology was bad, but Krux told him that he won't until the find the final Blade, a task to which Acronix's BorgWatch was utterly useless. As Krux returns to Machia's ship, he quietly told himself that their mother always said Krux was stubborn.
While this happened, Kai and Nya reunited with Ray and Maya, their father and mother respectively. Kai told Nya that they were the enemy, saying they've been helping Krux and Acronix for years. Maya told them they forced them to work for them, explaining what truly happened. When Krux and Acronix were still the Elemental Masters of Time, Wu devised a plan that involved Ray and Maya's skill. Wu tasked them with creating the Time Blades in order to strip Krux and Acronix of their powers. However, that left them weakened once the deed was done, explaining why they weren't present during the battle with Krux and Acronix and the monastery. They further explained that after Krux and Acronix went after the Blades by going into the temporal vortex, Wu saw a vision that described the exact date of when Acronix would return to the monastery. However, Krux escaped the vortex and saw this vision as well. In the time between the battle at the monastery and Acronix's return, Krux created his master plan, starting off by breeding some Vermillion warriors. He then went on to capture Ray and Maya, threatening that if they didn't work for him, he would kill their children. Ray then tells them that his markings on the Vermillion helmets were a message for someone to find out the truth, saying that together, they could stop Krux and Acronix's ultimate plan to control all of Time.
Machia's ship had returned to the Vermillion Swamps. Kai forgave them for his accusations, Nya asked how Krux and Acronix planned on controlling all of Time. Ray revealed the blueprints for the Iron Doom, a mech that served as a transport for the Vermillion across Time. Maya then reveals that the reason why they captured Cyrus Borg was so he could build a power source for the Iron Doom, which involved harnessing the powers of all four Time Blades. Simultaneously, Krux and Acronix, along with a battalion of Vermillion warriors lead by Machia, snuck up onto the blacksmith shop, where they high-fived and overhear that the Reversal Time Blade, the fourth and final Time Blade, was ultimately placed in the Boiling Sea by them under the orders of Wu after they discovered it in the woods below the monastery, saying they only the Masters of Fire and Water could get it. Maya realize that Kai and Nya could be used, the group were about to leave but were confronted by Krux and Acronix, who then wants them to obtain it for them. After pausing Ray with the Pause Time Blade and revealing Wu, Acronix told them the Reversal Time Blade was the only way to undo the effects of the Time Punch on Wu, with Krux saying that if they want to save Wu, they will retrieve the fourth Blade for them. With that, Acronix, Krux, Machia, Wu, Kai, Nya, Ray, and Maya board Machia's ship offscreen and proceed to the Boiling Sea, passing over the other ninja when they were confronted by the Vermillion lead by Blunk and Raggmunk.
After Machia's ship approachs the Boiling Sea, Krux told his brother that the final Time Blade would soon be theirs. Machia wondered if it was a ninja trick, Acronix responded that it best not be for the sake of the dying Wu. Upon arriving, Ray explained they need the Dragon Blade, he took it from Krux. Acronix asked him what he was doing, Machia immediately attacked Ray, but he told them that the Dragon Blade was the key in getting them the last Time Blade. Krux told him that it's only one Blade and that they still have three Time Blades. Acronix said that escape was futile, though he would like to see them try. Krux ordered Machia to give the Blade to Kai and Nya. Acronix then witnessed Kai and Nya create the Fusion Dragon and used it to plunge into the Boiling Sea in hopes of obtaining the final Time Blade.
After a while, Acronix wonders where Kai and Nya are, asking Krux what to do if they failed. At that moment, the two return on the Fusion Dragon with the Reversal Time Blade in hand. After landing on the ship, Kai rushes to use it on Wu but is stopped by Acronix and Krux, who revealed they lied about allowing Kai to use the Reversal Time Blade to save Wu, asking him what did they expect to allow Wu to remain after all the trouble he has caused them in the past. A fight begins, with Acronix fighting Nya with the Pause and Forward Time Blades. However, he is kicked away by Nya after Machia is knocked into Krux.
As Kai rushes to Wu's aid, Acronix appears from behind and is about to strike Kai with the Forward Time Blade, but Kai is pushed out of the way by Ray, who takes the hit instead, causing him to begin to rapidly age. Rejoining with his brother, Acronix then pauses the group, with Krux commending his brother for his work. Now with all four Time Blades, Acronix says it is time to return to the swamps, with Krux asking what to do with the others, with Acronix ordering Machia to drop them off at their current location. After disposing of them, they return to the Vermillion Dome of Doom at the Vermillion Swamps.
Upon arriving at the Dome, they see that the other ninja are attacking and that Zane, Samurai X, and Cyrus Borg are attempting to disable the Iron Doom. Ordering Machia to proceed as planned, Krux and Acronix jump off the ship and land behind the trio. Krux then proceeds to pause the trio with the Pause Time Blade just before Zane could put in the final number to disable the Iron Doom, with Acronix saying they have zero chance. After plugging in the four Time Blades into the Time Apparatus and the Iron Doom begins to power on, Acronix punches the trio off the side of the scaffolding, but they are caught by Jay, Cole, and Lloyd. Acronix, Krux, and Machia then board the Iron Doom after the other Vermillion warriors. As the Iron Doom destroys the surrounding scaffolding, it charges up and creates a temporal vortex in the skies above the Iron Doom. Krux tells Acronix that it will be ready in just a few more moments and Acronix says that Ninjago will be theirs and that nothing can stop them. At that moment, the Fusion Dragon arrives, to which Krux angrily asks his brother why he jinxed it. As the Iron Doom became fully ready, The Hands of Time then say their signature quote as the Iron Doom launches into the temporal vortex, unaware that the Fusion Dragon carrying Kai, Nya, and Wu followed them into the vortex.
The Iron Doom proceeds to travel back in time through the temporal vortex. Acronix admires the majesty of time travel, he takes a picture of the vortex with his BorgPad, saying it wasn't quite capturing the majesty and needed a different filter. However, Krux knocks the BorgPad aside and tells him that they are approaching their temporal destination before ordering Machia to ready her troops. As Krux explains to Acronix that decades of planning was finally about to pay off and that the battle will be re-fought, Acronix tells him that no one can stop them. The Iron Doom then begins to shake violently as it arrives in the past.
Landing at the Monastery of Spinjitzu forty years in the past directly after the past versions of Krux and Acronix were lost in time, the current versions of Krux and Acronix confront the past Elemental Alliance, where Acronix gloats over their confidence. Krux explains to them that they have stopped them once today, but it was before they had a legion spawned from the Great Devourer. After young Wu tells the group to focus, Acronix tells Machia it was time, who then orders her Vermillion army into battle.
Kai and Nya began to secretly help the past Elemental Alliance by posing as Ray and Maya, they begin to defeat the Vermillion. Krux says they are losing, Raggmunk and Blunk arrive, saying it was only a temporary setback. Acronix tells them that they did not travel across decades to suffer temporary setbacks, Krux nods to Acronix as they smash the two commanders into the component snakes before taking their helmets. As Machia arrives, Krux then reveals she too has outlived her usefulness and destroyed her, with Acronix saying she was relieved of her duties before boarding the Iron Doom.
Using their helmets, Acronix and Krux telepathically smash the rest of the Vermillion warriors and order them to return to the Iron Doom. As the snakes merge with the Iron Doom, Acronix tells the Iron Doom to arise as it comes to life and towers over the monastery. Using the Iron Doom, the Hands of Time are able to overpower the Elemental Alliance and capture young Wu, where they tell him their terms of surrender. Krux tells him that if he yields, they will destroy the Elemental Alliance, but will spare the citizens of Ninjago while Acronix tells him that if he refuses, they will still destroy them, but the citizens will not be spared. Krux asks him to yield, young Wu yields, ultimately changing the future into their image, but saving the citizens.
After throwing young Wu back to the other masters, the Iron Doom confronts them, with Acronix asking who they should destroy first between Garmadon and Wu. At that moment, the Fusion Dragon arrives and attacks the Iron Doom. Acronix said "Ray and Maya" are just as bad as their kids. Krux then tells him that they are their kids, ordering for a maximum barrage. As the Iron Doom fires Vermillion eggs at the Fusion Dragon, they all miss, and Kai and Nya blast the cockpit with their powers, knocking Krux and Acronix away from the controls. As Acronix says to fight Fire with Time, Krux tells him he hates his sayings before Acronix orders for full temporal energy. After the Iron Doom sends a Slow-Mo shot towards Nya, who bailed from the Fusion Dragon to retrieve something, the past Elemental Alliance distracts the Iron Doom. With this distraction, Kai slams the Fusion Dragon into the Iron Doom, causing it to fall onto the structure and look down the cliffside in a similar fashion as to Acronix and Wu's fight at the ruins of the monastery in the future.
After getting the Iron Doom back up, Krux said that he would destroy Kai and Nya even if he must do it with his bare hands. Acronix then told him that they still have the Iron Doom and that they could go anywhere in Time they please, saying that if the battle was too difficult in the past, they should go to a time where they are sure a victory and a time where Kai and Nya do not exist. As Krux suggests going further back in the past, Acronix suggests the opposite; far into the future. Using his helmet, Acronix uses the Iron Doom to open another temporal vortex. Just before they could leave, the Fusion Dragon attempted to strike it one last time, but Acronix orders it to duck. As the Fusion Dragon de-materialized, the Iron Doom entered the vortex as it closed behind them. Unfortunately for the Hands of Time, Nya managed to recover the past Reversal Time Blade from the woods below the monastery and used it to restore Wu. With the past Reversal Time Blade, Kai, Nya, and Wu reverse time so that they could follow the Hands of Time into the temporal vortex.
Aboard the Iron Doom, Acronix and Krux discussed their next course of action when they are suddenly confronted by Kai, Nya, and Wu. Furious over their constant interference with their plans, the twins engaged the trio in a final battle. When Kai and Nya began to overpower Krux, Acronix kicked down Wu in order to assist his brother. However, this allowed Wu to sabotage the Iron Doom while the twins were distracted with finishing off Kai and Nya, causing the Iron Doom to spiral out of control within the vortex. Once Kai and Nya were pushed out of the Iron Doom by Wu, Acronix and Krux regained their bearings before engaging Master Wu, ultimately becoming lost in time in the process.
After being lost in time, Krux and Acronix battle Wu. Wu gets supercharged with the Reversal Blade's energy, causing them to go back in time, to the Fire Temple just before Kai unlocks his True Potential. He tries to attack Lloyd, but Wu stops him, causing them to go back to the Iron Doom, where they discover Wu is becoming younger due to the Reversal Blade, upsetting Krux. They are then transported to the Temple of Light, where they try to attack Lloyd again. Wu chokes the twins with his staff before they could stop Lloyd from ringing the bell. Next, Wu and the Time Twins are transported outside the Monastery of Spinjitzu while child Wu and Garmadon spar with katanas on the other side of the wall. As the young Great Devourer lurks nearby, Wu's katana flies over the wall. Wu stops Acronix from picking up the sword and laments that while he wishes he could change this moment, as doing so would prevent Garmadon's transformation to evil, he knows he can't.
Wu and the twins continue to warp across several time periods, eventually ending up back on the Iron Doom, Wu has de-aged into a child. Krux mocks Wu's new form and bowl haircut, and Wu throws his staff at Krux and runs toward the time apparatus. When Acronix protests against this, Wu responds that the Hands of Time are no more than "second-hand thugs" before touching the apparatus with the Reversal Blade's energy inside him to halt the Iron Doom entirely.
Acronix appears in one of Master Wu's flashbacks while the latter was regaining his memories, particularly the moment Acronix, Krux, and Wu were all lost in time aboard the Iron Doom.
Acronix is a young man with long black hair tied in a ponytail using a black hair tie and sidelocks. He has hazel eyes and green facial tattoo with black detailings. His eyebrows and beard are black and red-highlighted.
His outfit consists of a black suit of armor covered in bright red and gray metal plating with gold outlining around his body, which has the elemental symbol of Time on the middle. The right sleeve and plating of his armor are gray. His outfit also has a black hood and mask with the symbol of Time and gold detailings on top. He also has a green half cape which sometimes drapes over his left shoulder.
During the Serpentine War, he wore a silver helmet identical to the one Blunck wears. He lost the original when he and Krux entered the time vortex and temporarily replaced it with Blunck's helmet to control the Vermillion.
Unlike his brother, Acronix is a very excitable person as he is fascinated by the uses of modern technology after having been sent forty years into the present. While he may give off a clueless air, he is a very skilled warrior who is very confident in his abilities and lives to fight all the time. He is quite ruthless as he didn't hesitate to batter Wu and insult him for being an old man since he last saw him. Acronix is also very impatient and short-tempered in nature, and would rather prefer the use of his modern technology rather than Krux's old-fashioned ways.
It appears Krux is the only person he cares about as he went to visit him and reconnected with him by hugging him in their reunion. He also ceased his battle with Wu and went to his brother's aid when Nya and Kai overwhelmed him. He greatly cares for and respects Krux, calling him "brother" instead of his first name, and he never disobeys him despite their differences.
According to Krux, Acronix has a habit of making up sayings, which the former hates. After returning to Ninjago and discovering technology, he began adding modern language to his otherwise formal speech.
Powers and Abilities
- Time (formerly): Acronix was gifted with half of the ability of Time, specifically Forward and Slow-Mo. He used this to great lengths, often using them to get the advantage over his opponents.
- Time Acceleration - Acronix was able to speed up time forward. It can be used to accelerate the aging of an opponent or to make him "teleport" by accelerating his own time for short periods. He could "teleport" others with him by touching them, such as his twin, or by choice. This appears to involve green temporal energy. This power is currently stored in the Forward Time Blade.
- Age Acceleration - Nicknamed the Time Punch by Acronix, this allows him to accelerate someone's age, eventually leading to death. It can only be reversed by using the opposite power, Reverse, on the one affected.
- Time Reduction - Acronix was able to slow down time, reducing the movement speed of the affected object, person, or area. He mainly used this power to slow down an opponent's attack and moved away from them. This appears to involve blue temporal energy. This power is currently stored in the Slow-Mo Time Blade.
- Time Reduction Ball Projection - When Acronix fired a Slow-Mo bubble at his opponent, this created a powerful energy field, slowing down the target and nearby objects caught within the bubble. It is possible to knock objects or people out of the energy field.
- Time Acceleration - Acronix was able to speed up time forward. It can be used to accelerate the aging of an opponent or to make him "teleport" by accelerating his own time for short periods. He could "teleport" others with him by touching them, such as his twin, or by choice. This appears to involve green temporal energy. This power is currently stored in the Forward Time Blade.
- Hive Mind: With Blunck's helmet, he can control the Vermillion.
- Combat: Acronix is a highly capable fighter, one of the best Wu has ever seen.
- Perfect timing: Acronix knows when to dodge opponents with ease. This is not part of his Elemental Powers, but a skill of his own.
- Swordsmanship: Acronix is a skilled swordsman. He can wield two blades without setbacks.
- Fast learning: Acronix had quickly able to learn how to use technology within a day despite being lost in time for four decades.
- Technology Proficiency: Even though he was outside of time for four decades, Acronix is fairly capable of using technology.
- BorgWatch: Acronix's second and favorite piece of technology. He uses this to find the remaining Time Blades with the temporal scanner. He also uses it to post on his Instabook account.
- BorgPad: Acronix's first piece of technology to own. He got it from the museum gift shop. He mainly uses it to take pictures or play games on it.
- Technology Proficiency: Even though he was outside of time for four decades, Acronix is fairly capable of using technology.
- Time Blades: Acronix wielded the Time Blades before plugging them in the Iron Doom.
- Forward Time Blade: Acronix main weapon. He wielded the Forward Time Blade that gave him his former ability to go forward Time. He used the Time Blade to inflict the Time Punch onto Wu.
- Pause Time Blade (briefly): Acronix briefly wielded the Pause Time Blade, which gave him Krux's power to pause Time. He used this to pause Ray, Maya, Nya, and Kai to leave them at the Boiling Sea.
- Bo staff (formerly): When he and Krux fought against the Elemental Alliance, he wielded a bo staff.
- Katanas: Acronix wields several katanas.
- Dagger (formerly): Acronix wielded a dagger when he was fighting with Wu at the Monastery. He dropped it when he nearly fell to his death.
Vehicles and creatures
- Iron Doom
- A massive snake-like mech that was created for Acronix and Krux to travel back in time and win their battle against the Elemental Alliance. With Blunck and Raggmunk's helmets, he and Krux can order the Vermillion to fuse with the mech. This allows them to have full control over the Time Blades, Iron Doom, and the Vermillion simultaneously.
- It first appeared in "Out of the Fire and Into the Boiling Sea."
Because Acronix was carried off inside the Time Vortex, the past 40 years have gone by for him in the blink of an eye. So while his brother Krux aged in real time over the four decades, Acronix looks just the same as when he disappeared. As an Elemental Master of Time, Acronix could manipulate time forward, both with great speed or in slow motion. Although Wu and Garmadon stripped him of those powers, he remained a tactical fighter who Wu described as one of the best he’s ever seen. Acronix’s skill with any weapon can lead him to be overconfident at times, and he will throw himself into a fight like a blunt object with little concern for the consequences… mostly because he’s sure there’s no way he could ever lose! Acronix loves all the technology and gadgetry he never experienced because he missed the last 40 years. His favorite is the BorgWatch.
Acronix is a skilled combat fighter with a love for the modern technology that his brother despises. Acronix can:
- Slow down the field of time; causing a loss of speed.
- Move forward in time for a short period.
- Main article: Acronix's relationships
- Acronix and his brother are named after a digital file-sharing software used for processing the show. Acronix is named after Acronis.
- Acronix's name also sounds similar to the prefix "chrono", which refers to time, though this may be a coincidence.
- Acronix's name is similar to the word "chronic" which means long-lasting.
Behind the scenes
- Acronix and Krux were originally meant to be one character, named "Kronos."
- Like Lloyd, Acronix's hairpiece was originally used for a Star Wars character, as a brown version first released with Qui-Gon Jinn.
- Acronix's hairpiece is older than Lloyd's, as the one Lloyd uses was originally released in 2008, while the one Acronix uses was originally released in 1999.
- Chen and Clouse being responsible for the betrayals of Krux and Acronix was originally a scrapped idea for The Hands of Time.
- Acronix is one of the two main villains to be included in just one set, the other being the Omega.
- He and his brother are two of the eight characters to have a cape in the sets, the others being Chen, Morro, Harumi, Wu, Akita, and Mammatus.
- In the sets, his headpiece has a bandage, though it wasn't in the television show at any point.
- Though the colored detailing around Acronix and Krux's eyes was simply a designer's choice with no specific explanation, one possibility is tattoos.
- In regards to where Krux and Acronix went in time, Ian Hanlin, Acronix's voice actor, stated, "There's a whole lot of timelines and a whole lot of time streams, and they could be anywhere."
- When asked if he hoped Acronix would return, Hanlin said he hoped that, "when least expected, suddenly everybody starts slowing down and reversing, and then oh-ho-ho-ho-ho-ho..."
- His voice sometimes changes from normal to somewhat raspy.
- Before having his powers drained by Wu and Garmadon, Acronix was able to fast forward and slow down the flow of time.
- Acronix has shown to be ambidextrous or cross-dominant.
- Acronix's favorite piece of technology is his BorgWatch. He is also quite fond of his BorgPad.
- Acronix appears alongside his brother as a boss in The LEGO Ninjago Movie Videogame in "The Dark Swamp" training dojo and can be unlocked as a playable character if the player achieves gold medal status in the said dojo, which requires the player to accumulate at least 90,000 studs.
- In the game, despite being depowered, Acronix can use his forward abilities as a playable character.
- While Krux is old and loathes modern life, Acronix is young and very fascinated by all of Ninjago's advancements and technology.
- In "The Hatching," he claims he likes the idea of returning to pre-modern Ninjago. However, he probably lied to Krux to please him.
- Acronix has a habit of putting his hands on his hips when he's upset or confident.
- Krux teasingly suggests Acronix has a crush on Supreme Commander Machia in "A Line in the Sand"; Acronix admits she is cute on the surface, but deep down is a pile of snakes.
- Acronix is chronologically three minutes younger than Krux, though after being lost in time, he is now biologically forty years younger than his brother.
- While Acronix insults Wu for being old, he doesn't care Krux became an old man by the time he returned.
- When Kai pointed out Krux looks (and is) much older than Acronix even though they are twins, Acronix admits that Krux was born three minutes earlier than him.
- Acronix would still be the younger Time Twin even if Krux had stayed in the temporal vortex with him.
- Main article: Acronix/Gallery
- "A Time of Traitors"
- "The Hatching"
- Way of the Departed Chapter 9
- "Pause and Effect"