Amnesia

Using a new machine in the school’s physics and chemistry lab, XANA manages to create nano viruses, tiny machines capable of attacking memory cells in the human brain. Our heroes are XANA’s principle targets and Ulrich is the first one to go down. Seeing that her heart’s desire is suffering from amnesia, Sissi takes full advantage of the situation: she fools him into thinking that she is his girlfriend and that Odd, Yumi and Jeremy are his sworn enemies… It’s a difficult situation, all the more so because the nano viruses are starting to affect the whole population! Luckily, our heroes can once again join forces on Lyokô and save the world from amnesia!