Originally published in single magazine form as Adventure Time: Beginning of the End, no. 1-3.
Created by Pendleton Ward.
Summary
"When Finn breaks a promise he doesn't even remember making, he finds himself on a quest through time as it unravels around him. Travel through Finn's past, present, and future--all that was and what could have been--as he faces down the fearsome Chronologius Rex. Meanwhile, Jake enlists the help of all of Ooo to get his best bud back before it's too late."-- Provided by publisher.