Code Lyoko

Four teenagers discover a factory containing a quantum computer. Jérémie activates it and, at the same time, awakens a dangerous program called XANA, which, having gained its independence, seeks to destroy Earth. To do this, it infects memory towers, which serve as its intermediaries with the real world, within the territories of Lyoko. Aelita, a young virtual humanoid creature, is XANA's only enemy present on Lyoko. She can count on the help of four friends: Yumi, Ulrich, Odd, and Jérémie. Middle school students, they lead a double life in the utmost secrecy.