Princess Bubblegum only wants what is best for her kingdom...most of the time. After an experiment of hers goes wrong, Ooo is under attack and this time, Finn and Jake won't be able to help. Princess Bubblegum must stand up and fight her own creation, but with the help of Marceline and... Lemongrab? It shouldn't be too hard to save the day, right? Collects Adventure Time issues #20-24 in a deluxe, leather-bound hardcover featuring a die-cut cover.