The Dark Monsters are the more powerful versions of the regular X.A.N.A. monsters, with a darker color palate. The only dark monster seen in the show is William's Black Manta. Dark Monsters have the same weaponry as their normal counterparts. However, their weapons do more damage and they have more life points. They were primarily seen in Code Lyoko: Get Ready to Virtualize, Code Lyoko: Quest for Infinity and Code Lyoko: Fall of X.A.N.A..
|Kankrelats | Hornet | Blok | Krab | Megatank | Creeper | Manta | Black Manta | Guardian | Tarantula | Scyphozoa | Kolossus|
|Spectre | Polymorphic Clone|
|Kongre | Shark | Kalamar|
|Video games only|
|Cyberhopper | Exploding Roachsters | Scorpion | Insekt | Dark Monster | Volcanoid | Ubertank | Omegatank | Mountain Bug | Insekt Lord | Ice Spider | Desert Driller | Magma Worm|