One day four students found a super computer in an abandoned factory. There they met Aelita who was the guardian of Lyoko. So when ever the super virus X.A.N.A. plans an attacks, Yumi, Ulrich, and Odd go to Lyoko and protect Aelita for her to go to the towers XANA activated. So she'll be able to stop his attack and go back in time. They have to keep up with their school work and his attacks for just students. X.A.N.A. can come up with the biggest and sometimes treacherous way to destroy our heroes or the world, especially with the help of some of his monsters.
Recaps2x25: Revelation recap
: After a successful mission into Lyoko the group has enough data to decode Franz Hopper’s diary. They decide to decode it in a bit. At school Odd gets a call from a mysterious "lover" and tells him to go into the forest. The super scan picks up an activated tower and the group heads for the factory. Except Odd, he was attacked in the forest by X.A.N.A... read more.1x18: Killer Music recap
: After a quick overview of the city we see Ulrich trying to study in his shared dorm room. Odd, however is blasting his music on his headphones. Odd irritates Ulrich to the point were he leave to go study in Jeremie’s room. Odd doesn’t seem to care very much and goes back to listening to the music he downloaded from the internet... read more.1x17: Amnesia recap
: It starts out in the ice sector as X.A.N.A. activates a tower. In Mrs. Hertz class [empty] X.A.N.A. creats some nano goo in a nanosphere. Later when the class is there Mrs. Hetrz is explaning Nano technology. Sissi makes a funny comment and gets laughed at. As ulrich takes a sample odd shoves ulrich's nose into it, it zooms in and we see some nano machines... read more.1x10: The Girl of the Dreams recap
: Its starts with Jeremie trying out a new virtualization program for Aelita. It fails though. Jeremie enters one more adjustment, launches it again, and then leaves for school. In Lyoko Aelita is attacked by something... read more.1x8: End of Take recap
: It starts off with a large group of students watching an alien movie. After the alien movie the principle introduces the director James Vincent. The Director tells everyone he will be shooting his next movie in a factory near the school. When the gang realizes it’s the factory with the supercomputer, they are determined to get him not to use the factory... read more.