Kod Lyoko Sezon 2 Odcinek 24: Contact

Our heroes are doing battle with Sissi who is acting very strangely. Could X.A.N.A. be controlling her? This hypothesis is quickly discarded as Sissi does not seem interested in harming our heroes... rather, she appears to be trying to tell them something. The truth comes to light when an activated tower is discovered on Lyoko -- something or someone else has taken over Sissi in an attempt to contact the gang. After overcoming a series of obstacles and fighting against X.A.N.A. (which tries to block all contact between Sissi and our heroes) they realize that it's Franz Hopper (who must be somewhere on Lyoko) who wishes to communicate with them...