Synopsis

Following William's acceptance into the group, a series of unforeseen circumstances leaves him and Aelita as the sole defenders of Lyoko's core. During his initial foray into the virtual world, Xana employs the Scyphozoa to take possession of him, transforming him into the commander of an immense army dedicated to the destruction of Lyoko’s central processing unit. Despite their valiant efforts, the team is unable to prevent the possessed William from dismantling the core, effectively disabling