Fight to the Finish (S04E29)

Having given up on the idea of destroying all of the Replikas after discovering how numerous they are, and particularly after the loss of the Skid, Jeremy returns his efforts into multi-agent systems, his only remaining means of defeating Xana. But while hard at work on an anti-Xana program, Franz Hopper again makes contact with our heroes to arrange a meeting on Lyoko. (Prime Video)