Wrong Exposure.Aelita finds a photo of herself with Franz Hopper at the Hermitage, with a mathematical equation in the background. Jeremy discovers that the program works as a reset feature to Lyoko, something not too helpful, but useful nonetheless. Meanwhile, Odd, in an attempt to impress a girl in photography class, inadvertently sends the photo to Sissi, who in turn shows it to her father. He questions the group about it, with Jeremy pointing out that Aelita would obviously be 22 by now if she were the one in the photo. They are sentenced to detention in the library by Jim before any more discussion occurs. Before he can follow up on the matter, Principal Delmas is possessed by X.A.N.A.. He delivers Aelita to Lyoko, where the Scyphozoa is waiting for her. It takes control of her and tries to force her to walk into the Digital Sea, but Ulrich and Yumi are there to keep her from doing so. As they battle Aelita and the monsters, Jeremy uses the reset program, clearing Aelita's possession and allowing her to deactivate the tower. After performing a return trip to the past, Aelita explains that her real last name is not Hopper at all, it's Schaeffer (the name listed on the folder in the end credits). Hopper is actually the maiden name of her mother, Anthea. In addition, Franz's supposed first name is actually his middle name, his first name actually being Waldo. Franz apparently changed both his and Aelita's names when they moved to the Hermitage in order to have a fresh start.