Code Lyoko: Evolution

Enjoying their normal lives, Jeremy Belpois, Ulrich Stern, Odd Della Robbia, Yumi Ishiyama and Aelita Schaeffer soon discover that there is trouble still brewing at Kadic Academy. Even worse, the five best friends discover that their old and greatest virtual enemy - the evil, sentient and autonomous artificial intelligence/multi-agent system XANA - is somehow back and even stronger and more dangerous than ever before, as a highly evolved and modified version of itself. XANA now wants to take back its power - source codes that were implanted in the electromagnetic parts of the bodies of Aelita, Odd, Ulrich, and Yumi during the time of its supposed "destruction" in order to gain control over the world network once again. The war against XANA is far from over, and the five Lyoko Warriors are back in action.

After successfully reprogramming the Skid, Jeremy and the four other Lyoko Warriors discover another Replika in the Digital Sea called the Cortex. They intend to learn more about this mysterious, ever-changing sector. Meanwhile, William finds himself accepted temporarily into the group and aids them in the Cortex. Aelita also finds something very mysterious about her late father in the Cortex's interface.

When a kid goes up to hug Aelita, he leaves and comes back and does the same to Yumi. Jeremy immediately realizes that XANA has sent a specter to retrieve the codes it implanted into four of its greatest enemies to regain its full strength and power. So they go to Lyoko and attempt to deactivate the tower in the Desert sector while Odd stays at the school to hold it off, but the situation escalates when Aelita gets hit and is devirtualized. She guides Yumi from Earth, supposing that XANA's source codes can allow the others to deactivate towers. Her theory is correct and Yumi deactivates the tower, only to reveal another one masked by the first's signal; another spectre is somewhere on Earth.