Plot
An evil and sinister sentient artificial intelligence known as X.A.N.A., is obsessed with world domination. To do this, he first must escape a supercomputer that imprisoned him. X.A.N.A. is able to attack the real world by activating towers on Lyoko, which act as links to the real world. When these towers are activated, X.A.N.A. is able to seize control of other computers and electrical systems as well as occasionally possessing organic life-forms or generating copies of them. In order to end an attack, Aelita must get to the activated tower(s) out of Lyoko's five sectors to deactivate them, thus neutralizing the attack on the real world.
Once the danger is averted, the Lyoko Warriors can use the supercomputer to return to the past, leaving no one except themselves to remember any of the events that transpired. To complicate the situation, they must do this while ensuring their classmates and teachers are not killed (going back in time cannot bring back the dead), and deal with many clashes of personality at the same time. Once back in time, they can use their knowledge of the future to alter events in their favor. This usually entails taking steps to keep one of XANA's attacks from taking place, though they do use the knowledge to prevent other unfavorable events that may not be related to X.A.N.A. As a downside, returning to the past adds a qubit to the supercomputer, greatly strengthening and doubling its power and therefore X.A.N.A.'s with each use (in the first two seasons only, as X.A.N.A.'s connection to the supercomputer is lost by season three).
Read more about this topic: Code Lyoko
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