Jake gets Rotwood fired and the school gets an even worse principal
9.8
"Superb"
The episode starts off on the school's Parents Night, where Jake sabotages Principal Rotwood's speech as payback for all of his targeting. As a result, Rotwood gets sacked, and a new principal, Sigmond Brock, takes his place.
At first, Brock seems too nice to be true, but he, like Rotwood is obsessed with magical creatures. In fact, he was the man who taught Rotwood everything he knew about magical creatures to begin with, and was notoriously strict towards his student. Having taken note on how Jake, Spud, and Trixie are always sneaking around whenever there's a magic-related incident, he suspects one of them to be the dragon. As part of his plan to expose the dragon, Brock has developed a powerful chemical dubbed "Brockium", which forces any disguised dragon to revert upon exposure. With the dragon exposed and his dragon theories finally revealed as truth to the public, Brock would be able to get monetary funding to further his research, as well as develop more Brockium.
Finding himself in hot water, Jake heads home, only to find Rotwood in his basement, looking over some photos (including a photo despicting the dragon). After learning of Brock and his plans, Jake and Rotwood devise a plan to get rid of the freak Principal.
The plan, however, backfires horribly, and Jake and Trixie fail to get the Brockium. Brock, however, is given some new information regarding the dragon's identity... by Rotwood!
Deciding not to wait any longer, he captures Jake, Spud, and Trixie the next day. Imprisoned in a cage, Brock intends to expose the dragon before a large crowd. However, he's shocked when his Brockium has no effect on Spud, whom he suspected. As it turned out, Rotwood misinformed him intentionally. Before he can react, Brock is run off the stage by a mob, who are angry that he, as a principal, is endangering students.
Brock is fired and Rotwood is reinstated as principal. The next day, at lunch, Rotwood asks to shake hands with Jake as thanks. The two do so... with Jake's hand turning into his dragon claw in the process. Surprisingly, Rotwood suspected Jake the whole time, and was fortunate to find one last drop of Brockium in the vial that Brock dropped. Rotwood swears that he will expose Jake as the dragon, in a way in which Rotwood will get all the credit.