In Wizard City, a magic spell backfires and turns Ice King back into Simon. Now with Finn, Jake and Marceline's help, Simon finds a way to bring his beloved Betty back. Finally reunited with the love of his life, everything is great! There's just one catch...without his magic crown, Simon will die.

Tired of all of Princess Bubblegum's talk about "responsibility," Lemonhope yearns for true freedom. So he sets off on the greatest adventure of his lemony life.