Release Date : 2003
Genre : Sci-Fi , Adventure , Animation , Action
No. of episodes : 205
Description : One day four students found a super computer in an abandoned factory. There they met Aelita who was the guardian of Lyoko. So when ever the super virus X.A.N.A. plans an attacks, Yumi, Ulrich, and Odd go to Lyoko and protect Aelita for her .