Jeremy Belpos, a 14-year old student attending boarding school at Kadic Academy, Discovers a quantum supercomputer in an abandoned factory near his school. Upon activating it, he discovers a virtual world called Lyoko with an artificially inteligance girl named Alieta trapped inside it. Jeremy learns of X.A.N.A., a fully autonomonus, malovent, and highley intelligent multi system, that also dwells within the supercomputer. Using lyoko's powers X.A.N.A. can poesses electronics and objects in the real world like a virus to wreak havoc. X.A.N.A's primary objective is to eliminate anyone aware of the supercomputer's existance so that it will be free to conqure the real world and destroy all humanity. Jeremy is aided by Three Friends Odd Della Robbia, Ulrich Stern, and Yumi Ishiyama, who are virtualized in Lyoko to save both worlds from the sinister virtual entity to deactivate towers on lyoko while a new program called "return to the past" which allows anyone to travel back in time while anyone scanned into the supercomputer.
