The Colossus was a massive stone giant that was created by Lord Garmadon using his element to help conquer Ninjago. Shortly after Garmadon's battle with his son, he forged the Colossus from various massive rocks. It began wandering through Ninjago City, wreaking havoc and destroying buildings before the ninja intervened. In the ensuing chaos, the Colossus grabbed the Destiny's Bounty and crushed it, leading Lloyd and the others to believe the original ninja and Wu were dead.
A week later, Garmadon used the Colossus to maintain his oppressive hold on Ninjago City. The Colossus remained docile for a while before Garmadon awakened it to chase Nya's armored car. The being nearly crushed the vehicle, though it escaped unscathed. After Skylor absorbed some of Garmadon's Element, she was able to gain control of the Colossus; as she and Garmadon struggled for control, it stumbled and destroyed numerous buildings; in the process, an apartment building was razed and Harumi was seemingly killed.
Enraged by Harumi's supposed death, Garmadon unleashed the full wrath of the Colossus on the city with the intention to raze it, just as he had threatened to do to the Commissioner when he first took power a week prior. When the ninja finally returned with several dragons, they fought against the Colossus. Kai tied numerous chains around it, incapacitating the being. Although it eventually broke free, the Resistance, Wu, and multiple Ninjago citizens assisted in bringing down the titan. After Lloyd caused Garmadon to lose his power, the being crumbled into lifeless rocks.
Lord Garmadon and the Sons of Garmadon arrived at a village on their way to Ninjago City. When a villager told them that their village would fight, Harumi told Garmadon that the Villagers did not know of his power. Garmadon used his True Potential to form a mighty beast, the Colossus, causing the Village to yield to Lord Garmadon.
The Colossus attacks Ninjago City and Kai, Jay, Cole, Zane, and P.I.X.A.L. go to face it. They are surprised by its immense size and try to figure out how to destroy it. Cole cracks the ground, causing the Colossus to fall, but it just gets back up again. It holds onto some wires overhead, which Jay uses to electrocute it. It falls again but gets back up again. It swipes at a building, knocking a room away, revealing a citizen on the toilet. The ninja realize they cannot beat it the four of them board the Destiny's Bounty to get Lloyd and escape. They find Lloyd and try to get him on board. He throws the toddler Wu to them, but the Oni Titan then grabs the Bounty and crushes it. Lloyd and Harumi believe that the ninja and Wu were killed. In actuality, they survived, having been transported to another realm.
As Garmadon watched over the city from his new throne, the Colossus was seen guarding it, and after Harumi reported to Garmadon that Lloyd still hasn't been caught. Garmadon was posed to use Colossus to destroy half the city to draw him out, but Harumi quickly stopped him as that action was unnecessary and suggested sending Mr. E instead.
The Colossus stands inactive by Borg Tower while Garmadon executes Mr. E for his failure.
When the Resistance tries to infiltrate Borg Tower, the Postman emerges from a dumpster and runs into the Colossus.
When Lloyd broadcasted his speech, he referred to the Colossus.
When Lloyd, Nya, Skylor, and Dareth escape the garbage depot in their Armored Car, Garmadon activates the Colossus to catch them. It easily jumps in front of them. Nya begins to reverse the car, but the Colossus steps on it, starting to crush it with its foot. Lloyd pleads with his dad not to crush them, and for a second, Garmadon hesitates. He is then attacked by P.I.X.A.L., who he shoots from the sky. However, this gives Nya a chance to escape from the foot and drive away, the Colossus losing balance and falling down to the road.
The remaining Resistance members formulate a plan to take control of the Colossus and use it against Garmadon. Mystake shapeshifts into a doppelgänger of Harumi, who they recently took prisoner. They plan for "Harumi" to take Skylor to Garmadon, and using her element, she'll absorb Garmadon's power and use it to take control of the Colossus. Their plan succeeds, with Skylor gaining the element—though Mystake is killed by Garmadon.
After Skylor touches Garmadon, she attempts to control the Colossus, but Garmadon instead uses it to walk towards them. Eventually, she takes control of it, using it to fling Ultra Violet across the city and defeat Killow. She then sends it up Borg Tower, prompting Harumi to flee, as Garmadon tries to retake control of his Colossus. It then smashes into the top of the tower, destroying Garmadon's throne.
Garmadon keeps trying to retake control, fighting mentally for command, though Skylor maintains her grip on the being. As Harumi flees into a nearby apartment, the Colossus stumbles into the building. Realizing her fate is sealed, Harumi stands on the building's roof as it collapses. Enraged by her believed demise, Garmadon unleashes the Colossus on Ninjago, and it begins causing even greater destruction.
The Colossus approaches a nearby building, where Lloyd, Nya, Dareth, and an unconscious Skylor stand on the rooftop. As they flee the rooftop, the Colossus begins thrusting debris at them, before they ultimately escape. Consumed by rage, Garmadon continues the Colossus's rampage, as it continues smashing buildings apart in search of Lloyd.
After the original ninja return to Ninjago, along with a group of dragons from the Realm of Oni and Dragons, they reunite with their allies and prepare for a final battle against Garmadon's forces. That night, the original ninja and their dragons attack the Colossus. They fire their Vengestone Harpoons they gained from the Dragon Hunters, in a bid to incapacitate the Colossus.
Though the chains repeatedly hold the being, time, and time again it breaks free and continues causing destruction. Eventually, Kai jumped onto the Colossus and gets close enough to bind the chains together even tighter. With help from the people of Ninjago, as well as their master Wu and the Firstbourne, he manages to make the chains tight enough that the Colossus stumbles and falls. After Lloyd uses the Art of the Silent Fist against his father, Lord Garmadon loses his element of destruction, and Lloyd gains his back. Consequently, the Colossus loses all its strength, and its body crumbles apart into lifeless rocks once more.
- 85. "Firstbourne"
- 86. "Iron & Stone"
- 87. "Radio Free Ninjago"
- 89. "The Gilded Path"
- 91. "The Weakest Link"
- 92. "Saving Faith"
- 93. "Lessons for a Master"
- 94. "Green Destiny"
- 1. "Let's Dance" (painting)
- 145. "Shintaro" (painting)
- 165. "A Big Splash" (painting)
- 166. "The Call of the Deep" (painting)
- 180. "The Turn of the Tide" (painting)
- 1. "Curiosity" (painting)
- In the synopsis of "Big Trouble, Little Ninjago," it is referred to as a Colossi, while in the sets and the synopsis of "Saving Faith" it was called the Oni Titan. During "Green Destiny," it is referred to as the Colossus.
- Because there were going to be three stone giants at one point, an outdated Netflix description for "Big Trouble, Little Ninjago" referred to them as "Colossi," as this is the plural form of "Colossus." This may indicate that there was a miscommunication somewhere down the line in production or distribution, and the author of the official "Big Trouble, Little Ninjago" episode description misunderstood "Colossi" as the name of the individual stone creature.
- The Colossus' stone appearance bears a great resemblance to the armor given to a user wearing the Oni Mask of Hatred.
- The Colossus was one of the four most powerful and largest beings of Ninjago, the others being the Overlord (the most powerful), the Preeminent (the largest), and the Great Devourer (one of the largest).
- It plays a similar role to Meowthra from The LEGO Ninjago Movie (a giant monster Garmadon used to conquer Ninjago).
- Its size seemed to vary, being the same size as Borg Tower in one episode, but far shorter in others. It is far larger in the show than it is in the set.
- It's similar to the Stone Colossus of Ultimate Destruction from Nexo Knights, sharing a similar appearance, size, and role.
- It seems to have a consciousness of its own because it attacked the dragons while Garmadon was too busy to control it while fighting Lloyd and Wu.
- Antonia calls it a "giant stone monster" in "The News Never Sleeps!."
- The Hageman Brothers were inspired to create the Colossus after watching the anime, Attack on Titan. This makes it an example of a concept in the show that inspired a set, not the other way around.
- Part of the idea behind its appearance was that Garmadon subconsciously modeled after his father, the First Spinjitzu Master.
- This makes the Colossus the second large, humanoid creation to be somewhat based on the First Spinjitzu Master, the first being the Golden Mech.
- Michael Knap had initially pitched for the creature to have an appearance similar to a troll or Oni.