|File:Sueurs froides 348.jpg|
|First Appearance||Cold Sweat|
The Kolossus has four Eyes of X.A.N.A., however it is the large Eye of X.A.N.A. on its face and the one on its sword that must be hit to kill it. Hitting any of the large Eyes individually does nothing to the Kolossus, as shown when Yumi threw a fan at the Eye of X.A.N.A. on its face. The fan was seemingly destroyed and the Kolossus seemed unhindered by the attack. However, when Ulrich stabbed the Eye and kept his weapon there, the Kolossus was paralysed until X.A.N.A. drew energy from all the Replikas to help the Kolossus. Hitting any of the small Eyes on the sword makes the Kolossus halt for a short period of time.
If the Kolossus touches a Tower, the part of the Tower that the Kolossus is touching glows red - possibly because of the seemingly intense heat on its hands. The Kolossus destroys the Skid in Down to Earth by knocking it off the Tower it was connected to, making it crash in to the Digital Sea. The Kolossus was defeated by Ulrich, who was devirtualised soon after by the monster's corpse, which crushed him.
- The monster's name was given by Odd in Cold Sweat. He spells it with "K" so it's sounds like K.O., although he's not sure who will get K.O.-ed.
- Ulrich is the only one so far to eliminate the Kolossus, by stabbing it in both of its Eyes of X.A.N.A. (one on its head, and one on its sword arm).
- Odd once called the Kolossus "King Kong", in Down to Earth.
- Odd also called the Kolossus "the Heap" in the same episode.
- The creation of the Kolossus is a giant catalyst in the final episodes of the 4th Season.
- The fights involved in are all of decent importance…
- Freeing of William.
- Destruction of the Skid.
- Destruction of X.A.N.A.
- The Kolossus has only appeared in Ice-related areas (the Ice Sector and its Replika).
- Kolossus appear as final boss in Code Lyoko DS: Fall of X.A.N.A.
| Lyoko: Kankrelats | Hornet | Blok | Krab | Megatank | Creeper | Manta | Black Manta | Guardian | Tarantula | Scyphozoa | Kolossus
Earth:Spectre | Polymorphic Clone
Digital Sea: Kongre | Shark | Kalamar
Video game only: Mite | Exploding Roachsters | Scorpion | Insekt | Dark Monster | Volcanoid | Ubertank | Omegatank | Mountain Bug | Insekt Lord | Ice Spider | Desert Driller | Magma Worm