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.
Les Lyoko-Guerriers vont sur le Cortex pour virusser le supercalculateur de Tyron. Cela doit être leur ultime mission qui leur permettra d'anéantir XANA. Mais c'est un échec. Ils doivent attendre douze heures pour se revirtualiser, retourner sur le Cortex et finir leur mission. Seulement, un évènement inattendu se produit.
Ksenina posesivnost interneta skočila je na 95% i DŽeremi i ostali rade na tome da stave kraj veštačkoj inteligenciji jednom za svagda. Aelita je pozvana u Delmasovu kancelariju, gde se sreće oči u oči sa Tajronom. Otkrio je da je bio muž njene majke i njen očuh. On se cenjka sa njom, ili da obustave antivirus ili da ona više nikada ne vidi svoju majku. Ona beži u fabriku sa Jumi, a DŽeremi grupu upozorava na Tajronov GPS. Grupa stiže u srce Korteksa da unese virus da izbrišu Ksenu. Tajron, besan, naređuje da se ugasi njegov superkompjuter, gaseći na taj način i Korteks. Ipak, Od, Ulrik, Aelita i Vilijam bivaju spaseni. Na kraju, grupa konačno gasi superkompjuter.
أبطالنا على القشرة لحقن حاسوب تايرون العملاق بفيروسهم. يجب أن تكون هذه هي مهمتهم النهائية التي ستسمح لهم بالقضاء على اكزانا. لكنه فشل. يجب أن ينتظروا اثنتي عشرة ساعة ليتم تحويلهم إلى الوضع الافتراضي مرة أخرى، والعودة إلى القشرة وإنهاء مهمتهم. فقط، حدث غير متوقع يحدث. يذهب تايرون إلى المدرسة ويثبت أنه الوصي القانوني على اليتا: هو وانثيا متزوجان منذ أربع سنوات.
