Our heroes discover Sector 5 and seek to uncover some of its secrets, but first they must overcome its many traps. Meanwhile, Yumi's parents decide to visit, and she has a tough time getting away in order to help her friends in Lyoko.
Watch Now:AmazoniTunesYumi's classmate Johnny has a crush on her and won't let her out of his site, making it hard to help her friends battle the swarm of birds XANA sent to attack them. When she gets hurt the warriors must go back in time in order to save her.
Watch Now:AmazonOn her way to the forest as part of a science class field trip, Yumi becomes the target of the driver and the passengers on the school bus who all have been possessed by X.A.N.A. Meanwhile, Odd decides to compete against Jeremie and Herv in an election for student class representative.
Watch Now:AmazonAelita discovers she has a talent for deejaying after filling in at the school dance. Meanwhile, XANA possesses a teacher who kidnaps Aelita and sends her to Lyoko so the Scyphozoa can steal her memory - unless our heroes can save her.
Watch Now:AmazoniTunesDuring class, everyone's cell phones suddenly go off, and all of them are confiscated. Sissi is not happy about this and organizes a protest in response. Yumi joins the protest, since having cell phones is a necessary part of the group's fight against X.A.N.A. X.A.N.A. is using the school's antenna to take over the nearby television antenna. From there, he could take over a laser-equipped, military satellite.
Watch Now:iTunesTheo takes an interest in Sissi, Hervé becomes jealous and tries to get him expelled. X.A.N.A. possesses the cafeteria during lunch, trapping most of the students inside its electrified walls. Jeremie and Yumi leave the cafeteria before this takes place. Now Yumi has to get Aelita to the tower by herself before the cafeteria collapses in on itself.
Ulrich's fear of heights is embarrassingly uncovered in gym class. Upset, he goes off to brood in the woods and Yumi and Odd try cheer him up. However, all is quickly forgotten when XANA dispatches a pack of wolves to wipe them out!
Watch Now:AmazonGroup needs a drummer for a traditional rock band. Nicolas turns out to be the best, but Odd doesn't want anything to do with him. Meanwhile, X.A.N.A. tries to overload a nuclear power plant by storing electricity in a transformer and unleashing it on the plant all at once. Unsure if they can stop such an event, , they decide to tell the authorities.
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