Ninjago Wiki
They made me design Iron Doom, a transport to carry the Vermillion throughout time. With all those troops, they would be unstoppable.”
Ray to Kai and Nya, "Pause and Effect"

The Iron Doom was a huge mech created by the Time Twins, Krux and Acronix, Cyrus Borg, and the Vermillion. The Iron Doom mech is Serpentine in shape with two arms and a large copper sword held in each hand. When all four Time Blades are plugged into the time apparatus, it has the ability to time travel.

It was designed to help the Time Twins travel back in time to ultimately change the past into their image following their previous battle at the Monastery of Spinjitzu. However, the Iron Doom becomes lost in time while heading towards the future as a result of Master Wu ripping out the Reversal Time Blade from the time apparatus.

The mech itself was created at the Vermillion Dome of Doom and was made using the stolen metal that the Vermillion soldiers were tasked with obtaining.


Prior to The Hands of Time

While forcing Ray and Maya to create armor for the Vermillion, Krux also ordered them to design a mech that allowed them to travel through time. Ray designed the mech to appear like a snake to Krux's liking, but due to his lack of knowledge, he was unable to finish the actual component that allowed for time travel.

The Hands of Time

The Hatching

To begin their plans for creating the power source of the Iron Doom, Krux and Acronix kidnapped Cyrus Borg while he was being escorted to safety by Zane.

A Time of Traitors

With Cyrus Borg captured, Krux and Acronix tell the Vermillion generals Machia, Blunck, and Raggmunk to order their Vermillion forces to begin capturing workers around Ninjago, bringing them all to the Vermillion Swamps. While Kai is investigating a Vermillion helmet at the Ninjago Museum of History, he uncovers the truth about Dr. Saunders' identity and during the midst of their fight, he discovers Cyrus Borg locked away in a sarcophagus. However, Acronix and Krux manage to escape with Borg through the use of the Forward Time Blade.


The Vermillion continued to kidnap workers while the Ninja continued to search for a way to stop them. They also began to steal metal from around Ninjago, bringing it all to the Vermillion Swamps, where the construction of the Iron Doom's outer shell was to begin.

A Line in the Sand

While Krux was interrogating Cyrus Borg on why he hadn’t begun the construction of the Time Apparatus for the Iron Doom, Acronix informed his brother that the Vermillion were already hard at work on their various projects, such as the Iron Doom's outer shell, as well as armor, weapons, and vehicles for the Vermillion troops. While this happened, the Slow-Mo Time Blade arrived in Ninjago, to which Krux ordered Machia to inform the Vermillion troops collecting metal on the surface to change their plans and go after the blade. However, the Ninja managed to escape with the blade.

The Attack

Krux and Acronix angrily debrief Blunck and Raggmunk for their failure in securing the Slow-Mo Time Blade, saying that they need all four Time Blades for the Time Apparatus to work. While this happened, Borg attempted to sabotage the apparatus but was stopped by Machia.

Pause and Effect

Borg finally finished the Time Apparatus and made one last attempt to sabotage it with a special keypad he installed, but was once again stopped by Machia, who ordered her troops to install the device into the outer shell of the Iron Doom.

When Kai and Nya reunited with their long lost parents, they revealed the schematics for the Iron Doom, explaining to their children how Krux and Acronix planned to use it to travel back in time with their Vermillion troops. They also explained that it cannot be completed without the Reversal Time Blade, to which they had hidden away at the Boiling Sea. However, they soon realized Krux and Acronix could use this to their advantage, asking their children to leave, but they were too late; Krux and Acronix, as well as their Vermillion forces, confronted the four, revealing the dying Master Wu, saying that they are to get the Reversal Time Blade for them, or else Wu would die.

Out of the Fire and Into the Boiling Sea

While Kai and Nya were recovering the Reversal Time Blade from the Boiling Sea, the other Ninja were able to sneak into the Vermillion Dome of Doom, where they rescued Cyrus Borg, who explained what The Hands of Time are planning. However, they were confronted by Blunck and Raggmunk, but the commanders fail to see through their disguises until Jay accidentally blows their cover. Samurai X then arrived and assisted Zane in escorting Cyrus Borg to the top of the scaffolding around the Iron Doom in order to disable it while the Ninja were fighting the defending Vermillion forces below.

Meanwhile, Kai and Nya were successful in recovering the Reversal Time Blade from the Boiling Sea. However, they were double-crossed by Krux and Acronix, who were able to steal the blade from them while leaving them behind at the Boiling Sea with Ray, Maya, and Master Wu. However, they later were able to give chase to the Hands of Time with the use of the Fusion Dragon.

As Krux, Acronix, and Machia return to the dome, they see the ninja attempting one final attempt to disable the weapon. However, Krux and Acronix are able to pause Borg, Samurai X, and Zane with the Pause Time Blade just before Borg could finish putting in the abortion codes to disable the Iron Doom. As Machia gets her troops to enter the Iron Doom, Krux and Acronix plug in the four Time Blades into the Time Apparatus, causing the device to activate as the Iron Doom powers on. As Krux, Acronix, and Machia board the Iron Doom, the other ninja, Cyrus Borg, and Samurai X all watch in horror as the Iron Doom creates a temporal vortex in the skies above. As it takes off, the Fusion Dragon carrying Kai, Nya, and Master Wu, quickly drops off Ray and Maya before following the Iron Doom into the vortex just before it closed.

Lost in Time

The Iron Doom travels through the temporal vortex until it reaches forty years in the past, directly after the past versions of Krux and Acronix were lost in time. The Iron Doom towers over the Monastery of Spinjitzu while the fight between the past Elemental Alliance and the Vermillion begins. Meanwhile, Kai and Nya exit from their hiding place and attempt to remove the Reversal Time Blade from the Time Apparatus in order to save Master Wu, but to no avail. Master Wu himself then enters the cockpit, questioning what was going on. Kai and Nya explain the situation, but Master Wu tells them that if they change anything, they change everything before passing out again. The two then escort Master Wu out of the Iron Doom, hiding him under a tree just past a stone bridge before going to help the Elemental Alliance by pretending to be their parents.

After the Elemental Alliance is able to begin to gain the upper hand in their fight, Krux and Acronix launch their failsafe plan, destroying Blunck and Raggmunk and taking their helmets before destroying Machia as well. The two then return to the cockpit of the Iron Doom, where they use the helmets to telepathically order the Vermillion to fuse with the Iron Doom, bringing the mech to life. A long fight begins, with the Iron Doom seemingly gaining the upper hand until Kai and Nya use the Fusion Dragon to combat the Iron Doom. After Nya bails from the dragon to retrieve something, Kai delivers a critical blow to the Iron Doom, causing it to fall over and look down the side of the mountain, scaring Krux and Acronix. As Krux and Acronix get the mech up with their helmets, Acronix explains that they can travel anywhere it time they want, telling his brother that they must go far into the future if they are to win before using the Iron Doom to create another temporal vortex with the use of his helmet.

Kai attempts to stop them from escaping but fails as they escape into the vortex, leaving them trapped in the past. Nya then arrives with a restored Master Wu with the past Reversal Time Blade, revealing how she found it, but Kai says that they are still stuck in the past. However, Master Wu reminds them that they have the Reversal Time Blade before the three use it to reverse time, causing the Iron Doom to return back to the past long enough for the three to use the Fusion Dragon to follow them back to the present, but not before Master Wu gives the past Reversal Time Blade to his past self.

As the Iron Doom travels towards the future, Krux and Acronix are confronted by Kai, Nya, and Master Wu in the cockpit, where a final battle begins. During the struggle, Kai is knocked out of the main window, holding onto the edge of it as Krux confronts him, saying that he'll never interfere again before he is kicked down by Nya, allowing Kai to climb back into the cockpit. As Acronix kicks down Master Wu in favor of saving his brother, Master Wu realizes they are passing the present. As Krux and Acronix are about to kill Kai and Nya, Master Wu climbs out to the Time Apparatus and rips out the Reversal Time Blade, causing the Iron Doom to spiral out of control within the vortex. Master Wu manages to catch Kai and Nya from falling but lets them go while giving them the Reversal Time Blade, saying he is putting off until tomorrow for what cannot be done today. As the two return to the present, Master Wu confronts a defeated Krux and Acronix within the cockpit, saying it ends now. As the three fought, the Iron Doom continues to spiral out of control towards the future as it becomes lost in time with them still aboard.

Ninjago: Reimagined

Golden Legend (non-canon)

An abandoned Iron Doom was located on a grassy hill in a post-apocalyptic Ninjago.

Golden Hour

Krux, Acronix and Wu continue their fight on the Iron Doom as it travels through the vortex. Wu, having been hit by the Reversal Blade, causes them to jump to random points in the past for the duration of the fight. Eventually, he also begins to de-age following these jumps through time. Finally, when Wu has de-aged into a child, he leaps on the apparatus and uses his hands to put it to a stop, causing the Iron Doom to cease to function, and trapping it in the time vortex.

Powers and abilities

Due to its massive physical size, the Iron Doom is capable of overpowering most opponents. However, most of the Iron Doom's physical strength seems to come from the Vermillion snakes that make up the mech. Using the helmets worn by Raggmunk and Blunck, Krux and Acronix were able to telepathically control the Vermillion that made up the mech and thus able to control the Iron Doom.

The time apparatus on the mech's chest allows the Iron Doom to channel the power of the Time Blades, using their powers against opponents as color-coded energy beams. When all four blades are connected to the Time Apparatus, the Iron Doom is able to travel back or forward in time to whatever extent its pilots desire.

For conventional combat, the Iron Doom is armed with two massive swords that it normally carries on its back. It also has a cannon in its head that can fire a barrage of projectiles seemingly made from brittle, red-hot metal.

Official descriptions

Set description

Hurry to the Vermillion’s spooky swamp fort where Time Twins Acronix and Krux have captured Master Wu. Dodge the Snake Mech’s dangerous swishing tail and eye missiles. Evade the egg falling from the fort’s roof and free Wu from the prison. But look out—the Time Twins have got all 4 Time Blades and are plugging them into the mech's Time Portal. Stop them before they spin that portal and take control of time![1]

Vehicle description

This giant snake-shaped transport is Krux and Acronix’s ultimate weapon, initially coined the Vermillion Transport Armor (VTA). Reluctantly designed at sword-point by Ray and constructed under duress by the builders of NINJAGO City, the Iron Doom is built from all the metal stolen during Operation Heavy Metal. In the heart of the Iron Doom is an apparatus created by Cyrus Borg that harnesses the power of all four Time Blades to time travel.

When enough Vermillion snakes slither inside, the Iron Doom becomes an enormous, semi-sentient armored monster that is part machine/part snake and is several stories tall. The Iron Doom’s slithering power makes it extremely mobile and with its multiple arms and blades, it can take on numerous foes at once, dispatching them with ruthless ferocity. It is controlled by Krux and Acronix, who ride atop it and use the helmets they took from Blunck and Raggmunk to control it with their minds. Because the snakes that once formed Blunck, Raggmunk and Machia are among those that slithered into the Iron Doom, it speaks in a synthesized combination of all three’s voices. When the Twins traveled into the future, the Iron Doom has not been seen since.[2]

Mighty LEGO Mechs

Snakes allve! There's a battle going on in the swamp. The Time Twins have had the Vermilion warriors build a giant snake mech, and it's attacking the Ninia. Its giant eye fires missiles, its arms are protected by armor and hold multiple weapons and it can even time travel thanks to a whirling time portal. Yikes! Have Jay and Lloyd met their doom?



Ninjago: Masters of Spinjitzu

Season 7: The Hands of Time

Season 9: Hunted

Season 10: March of the Oni

Season 11: Secrets of the Forbidden Spinjitzu

Prime Empire Original Shorts

Season 13: Master of the Mountain

Ninjago: Reimagined

Season 14: Seabound

The Virtues of Spinjitzu


  • In the Portuguese-translated shows, its name translates as "Robot of Destruction."
  • The head of Iron Doom appears to be based on the physical appearance of the Great Devourer.
  • After absorbing the Vermillion snakes, the Iron Doom speaks in a combination of Raggmunk, Blunck, and Machia's voices.
  • The Iron Doom was created as a mech, but after the Vermillion warriors fused into it, it became a semi-sentient being.
  • In the show, the Time Blades are plugged into the time apparatus, but in the sets, they are clipped on LEGO clip pieces.
  • An image of the Iron Doom was featured on the Ninjago history mural in the rebuilt Monastery of Spinjitzu.


LEGO models

Promotional media

In Ninjago: Masters of Spinjitzu

The images on Iron Doom need to be organized.
  • You can help the Wiki by adding images to the appropriate section on "Iron Doom."
  • This template can be removed once images have been organized.

Season 7: The Hands of Time

Ninjago: Reimagined

Concept art


Language Name
Czech Kovová skáza (S7)
Železná skáza (Reimagined)
German Verhängnisvolle Dämmerung
Polish Żelazne Fatum (S7)
Żelazna Zagłada (Reimagined)
Russian Железная Гибель



Ninja vehicles

Lloyd: Golden Mech · Green Ninja cycle · Jungle Raider · Destiny's Shadow · Ninja Nightcrawler · Titan Mech · Racing bike · Lloyd's Race Car
Kai: Blade Cycle · Fire Mech · Kai Fighter · Prototype X-1 · Rocket boards · Super Bike · Katana V11 · Destiny's Wing · ATV · Mech Jet · Golden Dragon Raider
Jay: Storm Glider · Lightning off-roader · ElectroMech · Ghost Taker GT · Lightning Bike · Flying speeder · Blue Dragon · Sub car · Golden Dragon Motorbike
Nya: Samurai Mech · Proto Sam-X · D.B. Express · Nya's bike · Samurai VXL · Battle Wagon · Nya's bike (fantasy) · Ninja Tuner Car · Samurai X MECH
Cole: Tread Assault · Earth Driller · Earth Mech · Roto Jet · Ghost Cycle · Rock Roader · Rock Cycle · Speeder Cars · Stone Mech · Dragon Racer
Zane: Snowmobile · NinjaCopter · Ice Mech · Titanium Ninja Tumbler · Snake Bike · ShuriCopter · Zane's jet · Jungle surfboard · Golden Dragon Jet
Wu: Wu's horse carriage · Wu's ship
P.I.X.A.L.: Samurai VXL · Samurai X Mech
Team: Gliders · Destiny's Bounty · Ultra Sonic Raider · Ultra Stealth Raider · Land Bounty · Ninja hang gliders · Ninja's catamarans · Jungle Choppers · Hydro Bounty · APS suits · Submersible combat crafts · Mini submarines

Villain vehicles

Skulkin Vehicles: Skulkin mechs · Skull Truck · Turbo Shredders
Serpentine Vehicles: Bite Cycles · Fangpyre Robot · Fangpyre Trucks · Fangpyre Wrecking Ball · Rattlercopter · Serpentine Bus · Serpentine Express
Stone Army: Garmatron · Hoppers · Samurai Mech · Tusk · Warrior Bikes
Nindroid Army: Arcturus · Attack gliders · Destructoid · Double laser cannons · Golden Master's mech · Hover-Copters · Hover Hunters · Jet fighters · Lunar rovers · Nindroid jet fighters · Nindroid MechDragon · Security Mechs · Security tanks · Nindroids' jetpacks
Anacondrai Cultists: Anacondrai Battle Mechs · Anacondrai buggies · Blade-Copters · Chenosaurus · Chen's blimp · Chen's ferry · Clouse's stone mech · Condrai Crushers
Ghost Warriors: Chain Cycle · Ghost ship · Mech-enstein
Sky Pirates: Misfortune's Keep · Raid Zeppelin · Sky Shark · Pirate jet
Vermillion: Iron Doom · Vermillion Invaders · Vermillion Racers · Machia's ship
Sons of Garmadon: Oni Bike · Oni Chopper · Stone Booster Bike · Street bikes
Dragon Hunters: Destiny's Wing · Dieselnaut · HunterCopter
Unagami's army: Empire Dragon · Noodle Truck of Crime · Speeder Cars
Keepers: Battle catamarans
Kryptarium inmates and henchmen: Ronin's monster
Merlopians: Kalmaar's chariot
Vengestone army: Crystal hovercraft

Other vehicles

Cliff Gordon's yacht · Cyrus Borg's private helicopter · Firstbourne Mech · Garbage trucks · Jalopy · Mary Louise · NGTV helicopter · Noodle trucks · Postman's bike · R.E.X. · Ronin's Mech (non-canon) · Salvage M.E.C.

The LEGO Ninjago Movie vehicles

Secret Ninja Force: Destiny's Bounty · Earth Mech · Fire Mech · Green Ninja Mech Dragon · Ice Tank · Lightning Jet · Ninja Helicopter · Water Mech
Shark Army: Flying Jelly Subs · Garma Mecha Man · Piranha Mechs · Manta Ray Bombers · Shark Mech


Hero mechs

Samurai Mech · Fire Mech · Golden Mech · Earth Mech · ElectroMech · Ice Mech · Salvage M.E.C. · Samurai X Mech (P.I.X.A.L.) · Firstbourne Mech · Titan Mech · Mech Jet · Blue Dragon · Stone Mech · APS suits · Power Up Mech · Cole's mech

Villain mechs

Samurai Mech (Stone Army) · Security Mechs · Nindroid MechDragon · Golden Master's mech · Clouse's stone mech · Anacondrai Battle Mechs · Ronin's Mech (non-canon) · Mech-enstein · Chenosaurus · Skulkin mechs · Iron Doom · Empire Dragon · Snake Mech

The LEGO Ninjago Movie mechs

Earth Mech · Fire Mech · Garma Mecha Man · Green Ninja Mech Dragon · Piranha Mechs · Shark Mech · Water Mech