Join Yumi, Ulrich, Odd and Jeremy in their fight to save planet Earth and the parallel universe Lyoko from total destruction! The central computer that runs Lyoko, has been infected by a megalomaniacal virus, X.A.N.A, that wants to take over the world. Within Lyoko one virtual being by the name of Aelita is fighting to take X.A.N.A. down, but she can't do it alone, and has recruited a team of boarding school students from Earth to help her. Now X.A.N.A. has set his sights on Earth and is sending pieces of the virus through to Earth from 40 towers that spread across the digital realm. Only by reaching each of these 40 towers and shutting them down, can the group stop the virus and the mad super computer once and for all.