Code Lyoko, Season 4, Vol. 2

To teach her biology class about ecosystems, Ms. Hertz brings the entire ninth grade on a camping field trip to an isolated island in the middle of a lake. Only Yumi stays behind at the academy to make up some midterm exams.

Trying to impress Milly by bringing her a scoop for her paper, Hiroki swipes his sister’s personal diary, hoping to pass Milly some secrets. Only that he loses the diary (not realizing that the purloined journal has wound up in Ulrich’s possession), bringing the full wrath of Yumi upon him.

The Lyoko Warriors are planning a seek-and-destroy mission against the Supercomputer that created the first Replika, discovered on a previous mission in the network.

A return trip to the Amazon laboratory for our heroes, determined to finally destroy once and for all the Supercomputer housed inside. But first, the Lyoko Warriors will have to get past an army of arach-androids created by Xana.

During a routine mission, Odd takes the initiative of sneaking Kiwi onto Lyoko with him, against Jeremy’s wishes. Unfortunately, things do not go at all the way he had imagined... While the Lyoko Warriors struggle to deal with the resulting problems, Xana attacks by possessing a motorcycle gang who take over the factory.

Jeremy is becoming embarrassed and troubled by the increasingly human behavior of William’s clone, and says so to his friends. Unfortunately, the conversation is overheard by Milly and Tamiya who, believing that they have landed a scoop, set out to interview William’s double.

All of the Lyoko Warriors are headed back to their respective families for the winter holidays except for Aelita, whose past remains a painful subject, and who chooses instead to stay alone at the academy to better keep an eye on Xana.

Our heroes make another trip to the desert base and stumble onto a disturbing discovery. Their mission is made even more difficult as Odd, who broke a mirror just before leaving, seems to have brought nothing but bad luck onto himself and the others...

Thanks to Odd, Jeremy wins a ride in the back of a jet fighter, but the prize seems not to please the youth whatsoever. What can he do in a fighter plane if Xana attacks? Afraid of appearing chicken, he still shows up at the Naval Air Station to claim his prize.

Sissi hosts a beautiful and glamorous pen-pal from Iceland, a real knockout who drives all of the boys at the academy crazy... Every one of them! But the young girl seems to have eyes only for Odd, stoking tension amongst the gang.