Hiroki steals Yumi's diary and Ulrich finds it. Meanwhile, in a new attempt to free William from Xana's clutches, Jeremie creates a program to find William. When he uploads the program to the Skid, the sonar becomes bugged, forcing the gang to return to Lyoko. When the Kongres interrupt their return, Yumi gets stranded, and is lost in the digital sea. XANA's attempt to take advantage of this alerts Jeremie, allowing him to direct his friends to Yumi. After fighting off the Kongres and William, who has his own ship to travel in, they return to Earth. To help Hiroki apologize to his sister, Ulrich secretly returns the diary.
Elenco: Jodi Forrest , Allan Wenger , Paul Bandey .