Code Lyoko: Fall of X.A.N.A.

William is being held captive somewhere inLyoko by the evil virus X.A.N.A. and it's up to you to help the Code Lyoko Warriors find and free him! To achieve this goal Ulrich, Yumi, Odd an Aelita must complete a number of challenging missions in the different sectors of the digital world of Lyoko. X.A.N.A. has created a new virtual world consisting of Replikas based on Lyoko.