Code Lyoko Episode 30 - A Great Day Episode Title:A Great Day.Episode Description:After taking another trip to Sector 5 and returning to the school, Aelita talks to Jeremy about not being human, unaware that Sissi is recording their conversation. On top of that, the false data they retrieved from Sector 5 allows X.A.N.A. to take over the Supercomputer and starts running return trips over and over. Jeremy discovers the return to the pasts are making X.A.N.A. stronger and more powerful. During the third return trip, X.A.N.A. possesses Sissi with his newly acquired and greatly strengthened abilities, and goes after Ulrich. Not only does the group have to deal with Sissi, but they also have to stop the return to the pasts from continuing.