After a summer vacation, the group is still trying to find a way to fight XANA. Meanwhile, XANA is trying to destroy Lyoko, which gives the group little to no time to look for a proper way to fight back. He does this by targeting the core of Lyoko, which contains the code that maintains the virtual world. In a side-story, Odd blackmails Jim into asking the principal to put him in the same classes as his friends. Also, Yumi decides against having a relationship with Ulrich, thinking it would be better if they were just friends.
Stars: Carole Baillien, Julie Basecqz, Alexandra Corréa
Writer(s): Thomas Romain