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.
Recaps1x18: 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.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.1x7: Image Problem recap
: Its starts out with Aelita and Yumi heading for a tower. Aelita enters the tower. Meanwhile outside Yumi screams. In the scanner room Yumi is devirtualized out cold. Ulrich, odd, and Jeremie bring her to the nurse... read more.1x6: Cruel Dilemma recap
: Its starts out with the group, and their fellow classmates getting a lecture from the principle. At Jeremie’s room he attempts a virtualization test for Aelita, but it fails. He then leaves for a breather. Odd comes in the room and picks up a bag of candy. Jeremie comes back in and startles odd, which makes him drop the candy on the keyboard. Jeremie checks the program, and can’t believe it. The candy hit the keys modifying the program, and it works. Jeremie goes and tells the others. They respond it is far too early for Aelita to comes, they should make preparations first... read more.1x5: Big Bug recap
: It begins with Milly admiring Ulrich, from a distance, but Sissi comes over and insults her over boys. Sissi goes over to Ulrich to prove a point, but Ulrich tells her off... read more.