Code Lyoko - Season 1 Episode 26 -

Aelita's materialization program has worked, and she's now living on Earth. When Jeremie pulls the plug on Lzoko, Aelita faints. Jeremie believes that a virus was given to her by X.A.N.A. while he was bringing her to Earth which has linked her to the supercomputer, preventing the group from shutting it off. X.A.N.A. brings his Roachters into the real world in mass numbers and unleashes them on the school.