After washing ashore in France, Daryl struggles to piece together how he got there and why, as he navigates a fractured, walker-infested landscape to find his way home. During his journey, Daryl has to protect a young boy, Laurent, who is seen as a messiah, while facing new, dangerous walker variants and the "Power of the Living" paramilitary group, as the connections he forms along the way complicate his plan to return home.

Jérémie, Aelita, Yumi, Ulrich, Odd and William return to their daily lives as students of Kadic College. But XANA, the multi-agent program that had become their mortal enemy and that they had managed to destroy in their previous adventures, reappears. The Lyoko Warriors reactivate the supercomputer in order to return to Lyoko, discover the reasons for this reappearance and put an end to it before the Earth is threatened again.

Paris, La Chapelle neighborhood in the 18th arrondissement. Eleven-year-old Pablo coldly puts up with his mother’s messy life. Abandoned for the umpteenth time, he decides to set out to find his Spanish father. He hires Louis, a poker player who has met with hard times and to whom he has become mysteriously attached. But his father turns out to be just an illusion…