When old friends and enemies suddenly reappear in Ooo, Finn and Jake have to abandon their work building a dungeon and try to save the day, but they might need some help.

"Originally published in single magazine form as Adventure Time 30-34"--Title page verso.

Finn and Jake try to stop a skeleton named Lich from destroying the Land of Ooo.

Princess Bubblegum only wants what is best for her kingdom...most of the time. After an experiment of her's goes wrong, Ooo is under attack and this time, Finn and Jake won't be able to help.

Finn is about to fall head-first into an adventure so intense, he'll never remember it! Finn tries to take on the Mnemonoid only to wake up in the future with no recollection what has happened in the time jump! With his pals Jake, Princess Bubblegum, and Marceline, Finn must remember how to beat this mean dude before he forgets everything else! Collects issues #30-34.

When Fionna the Human rescues a feral flame boy from a pack of wild fire lions, it starts her on a quest she will never forget.

When Finn and Jake accidentally create doubles of themselves, things start to get out of control as the doubles multiply and overrun the Candy Kingdom. It’s double trouble throughout all of Ooo! When Finn and Jake discover an Adventure-themed Theme Park, our favorite adventurers get more than they bargained for when visiting the Wish Witch. Now stuck with an ever-growing amount of doubles, Finn and Jake set off to reverse the spell before the doubles overrun the Candy Kingdom. Join writer Kevin Cannon (Little Nemo: Dream Another Dream) and illustrator Joey McCormick on this tale of duplicitous duplicates in Cartoon Network’s Adventure Time.