Logbook

S1, E4: Sissi uses Ulrich's diary against him so that he will be forced to pay attention to her. The diary contains details of Ulrich's secret activities and of the existence of Lyokô. She takes advantage of a school trip to attack. But this is no time for Ulrich to get caught in a trap because X.A.N.A has taken control of the electric school bus he and the other students are travelling in. The bus, which has now become a kind of prison-on-wheels, is speeding towards the city's chemical complex.