|Height||3 meters in diameter|
|Speed||10/10 (instant capture)|
|Attacks||None. It's used as a holding area for one of the team. It can also hold a fake alternate reality.|
|First Appearance||Image Problem|
A Guardian is a monster which contains a warrior rather than attempting to devirtualize them. It is the only X.A.N.A. monster that doesn't have an eye and can't be struck to destroy it. Aelita described it as "a sort of digital jail adapted to the body imprisoned in it." While someone is captured; they are unaware of the passage of time.
Guardians look like giant orange bubbles that can imprison and disable a person. The only possible way to defeat a Guardian is to create a false version of the prisoner and place it next to the Guardian to confuse it, causing it to reject its prisoner. Usually, the false is also a bomb which is then detonated when the guardian rejects and expels the real person. This is usually accomplished with Aelita's Creativity. Once the clone is absorbed, the guardian explodes.
The Guardians never returned after the first season, possibly because X.A.N.A. realized how ineffective they were.
- The Guardian only appeared in Season 1.
- It only attacked Aelita and Yumi.
- It fell for the same trick twice with the fake clones of both Aelita and Yumi.
- The only monster that doesn't have the Eye Of X.A.N.A. on it.
| 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