Earth and the parallel universe called Lyoko face the threat of annihilation. A super virus, X.A.N.A., has infected the central processing units of the Super Computer. Only four kids know of the existence of Lyoko and can foil the mad computer's evil designs. Yumi, Ulrich, Odd and Jeremy lead double lives, ordinary boarding school students on earth and super heroes in the digital world of Lyoko.

X.A.N.A. is more relentless than ever in its attack against Lyoko and Earth. With Aelita as their virtual guide, Jeremie, Yumi, Ulrich and Odd must continue their daunting quest to shut down the super virus as it tries to blow up the city's nuclear plant. Can the team stop the invasion before it's too late?

Earth and the parallel universe called Lyoko face the threat of annihilation. A super virus, X.A.N.A., has infected the central processing units of the Super Computer. Jeremy, Yumi, Ulrich and Odd will have to battle through X.A.N.A.'s most dangerous obstacles yet. Can they pull together and put an end to the evil virus' reign of chaos?

It is a new year of school and this semester, Aelita joins Jeremy, Ulrich, Odd, and Yumi. Aelita is dealing with a new world, while being chased by X.A.N.A. and haunted by troubling visions. Join our heroes as their battle against X.A.N.A. continues: they discover new territories, battle new monsters and solve the mystery of Sector 5.