The Phantom of Crowley High returns and switches roles with Hannah to get Curtis back. The three dudes realize that Todd must lose his virginity to become the Pure Evil One. Atticus comes to terms with his past. And nobody can stop singing.
Atticus takes the book and brainwashes the students of Crowley High to do his bidding, forcing a showdown with Todd at the semi-formal. Secrets are revealed, romances blossom and tragedy strikes, threatening to tear apart the gang for good.
Curtis uses the book to give himself a new giant evil arm. Todd must face the truth about his evil destiny as he fights Curtis, and Jenny learns the truth about her father. Atticus tries to regain his place among the Satanists.
When a paraplegic student uses the book to give himself fast legs, Todd jumps on his back and gets transported to the future, where Atticus has taken over as Satanic Overlord.
A girl uses the book to become a better singer, but the spell backfires and her tongue falls out. She becomes the Phantom of Crowley High and Curtis falls for her. Meanwhile Atticus, Todd, and Jenny try to whip up a heavy metal musical.
A genius chess player gets his hands on the book and forms a bizarre cult in the chessnasium, convinced that Todd is the Pure Evil One come to bring about the apocalypse. The cult tries to lure Todd into a trap to destroy him.
Jenny's father, now out of his coma, tries to join the gang, but when he's rejected, he uses the book to steal people's skin and disguises himself as various male students to infiltrate the gang.
The gang tries to rescue Jenny from the retirement home, but when Atticus' disgruntled minion Bob uses the book to create a feast that makes everyone who eats it hungrier, they're forced to fight an army of seniors hungry for human flesh.
The gang make plans for a surprise party for Curtis's birthday, while a Puritan girl uses the book to make herself a giant birthday cake that eats students on their birthdays.