A Bad Turn.When Ulrich tries to tell Yumi how he really feels after some prodding by the rest of the group, he finds her talking to William, who is doing the same thing Ulrich had planned to. Yumi turns him down, but Ulrich leaves before hearing it. Meanwhile, X.A.N.A. activates a tower and materializes a Krab. At school, a driving class has been set up to teach the kids road safety. William turns out to be a good driver and Ulrich a rather poor one, which William makes fun of him for. The two then get into a fistfight, much to Yumi's annoyance. William and Ulrich both get detention because of the fight. Jeremy learns of the activated tower shortly after and the group heads to the factory without Ulrich. During this time, the Krab makes its way to Yumi's house. When the group reaches the factory, they find a second Krab guarding it. Yumi learns of the first Krab from Hiroki and goes to help while Odd distracts another Krab so they can get to the elevator. In the scanner room, they learn that the first two Krabs destroyed the scanners that produced them, leaving just one usable. Aelita goes to Lyoko first. Before Odd can go, however, a third Krab is materialized, preventing any further use of the scanners. Now Odd has to deal with this Krab, Ulrich and William have to deal with the second, and Yumi and her family have to deal with the first. Not only that, but Aelita has to make her way to the tower without any support, and uses her creativity ability to make a decoy for the Scyphozoa.