Video : Ultime mission

Our heroes are on the Cortex to inject Tyron's supercomputer with their virus. This should be their ultimate mission that will allow them to annihilate XANA. But it's a failure. They must wait twelve hours to be virtualized again, return to the Cortex and finish their mission. Only, an unpredictable event happens. Tyron goes to the school and proves himself to be the legal guardian of Aelita: he and Anthea have been married for four years. He gives her a terrible choice: find her mother again or infect his supercomputer. Aelita chooses to infect it, convinced that her mother would agree with her.

Seeing things get away from him, and wanting to avoid the destruction of his supercomputer by a virus at all costs, Tyron decides to shut it down. Odd, William, Ulrich and Aelita, who were already on the inside, risk being thrown into the Digital Sea forever. Our heroes get out of it just in time and turn their own Supercomputer off, merely paralyzing XANA, not destroying it.

Tyron becomes stuck: if he turns the computer on, the virus will activate and destroy his system. Despite this, the Lyoko Warriors have only won part of the battle. XANA and Tyron are both incapacitated, yet Tyron has all the time he needs to find a way to counteract the virus. There's also the problem of his guardianship to deal with.

As ever, the Warriors must remain on their guard as they begin a new battle: the one to keep their family together.