Code Lyoko Episode 4 – Log Book Episode Title:Log Book.Episode Description:When Sissi finds and steals Ulrich's diary, he is blackmailed into being her boyfriend. During a trip to a swimming pool, Jeremy and Yumi have the opportunity to find it. The new electric bus that is being used for the field trip is possessed by X.A.N.A.. and starts acting weird as a result. Yumi ends up finding Sissi's diary during this and uses it to blackmail her into giving up the location of Ulrich's diary. X.A.N.A. then turns the bus on the city's petrochemical plant, threatening to blow up a sizable portion of the city. Yumi is sent to Lyoko to help Aelita, but she is devirtualized in the process. Odd manages to escape from the bus, leaving him to take Aelita safely to the tower to deactivate it in order to end the attack.