Code Lyoko
Jeremie Belpois, a 13-year-old boy 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 a young girl, Aelita, trapped inside it. A series of bizarre events begin to occur at Kadic Academy. Jeremie learns of XANA, a malevolent artificial intelligence multi-agent system who also dwells within the supercomputer. XANA's goal is to conquer the real world and all human beings.
Throughout Season 1, Jeremie works to materialize Aelita into the real world and stop XANA. Jeremie is aided by his three friends Ulrich Stern, Odd Della Robbia, Yumi Ishiyama as they, along with Aelita, are virtualized into Lyoko in order to save both worlds from the sinister virtual entity. In "Code: Earth," Aelita is finally materialized, but the group discovers that XANA had planted a virus inside Aelita, which prevents them from shutting down the supercomputer.
The second season focuses on the group as Aelita adjusts to life in the real world while Jeremie searches for an anti-virus for Aelita. In Lyoko, a fifth sector is discovered and the group explores more of Lyoko's secrets and mysteries, while XANA attempts to steal Aelita's memory in order to gain the keys to Lyoko and free itself.
In the third season finale, the group is joined by William Dunbar. Once virtualized in Lyoko, William is possessed by XANA. He remains under XANA's possession for majority of the season, but is saved later on. After he returned he had a difficult time gaining the trust of the Lyoko Warriors. In Code Lyoko: Evolution he was referred to as a permanent addition to the group for the first time.
good versus evil, psychedelic