When Rainbow Dragon sends the Academy back, Jaden finds out that Jesse didn't come back. He says it's his fault and decides to rescue him. Shepard tells Jaden's friends about Yubel who Axel heard about briefly during the duel. When a portal opens to another dimension, Jaden is going to go through it alone in order to find Jesse, but his friends back him up and end up sending him, Syrus, Bastion, Jim, Axel, Alexis, Atticus, Chazz, Zane, Aster, Crowler, and Echo into it. (thetvdb.com)