Vertigo

S2, E18: Ulrich is afraid of heights... but he's never dared admit it to his friends. Until one day in gym class, he has to race William up the climbing wall and is humiliated by him in front of Yumi. Crestfallen, he goes off to brood in the woods. Yumi and Odd set off to find him and cheer him up... and that's when XANA decides to attack. It sends a pack of wolves to wipe out our heroes! Jeremy and Aelita must act fast on Lyoko!