|The following information is from the Adventure Time comic book series.|
It may not be part of the same canon or continuity as the animated series.
Issue 32 of the Adventure Time comics.
"Finn is on an impossible mission to break Magic Man’s curse so that he can finally live his life…and remember it! It’s going to take a lot of pal time and a lot of help from the best of friends but this definitely seems like an adventure that Finn and Jake can take—if only Finn could remember."
Comic preview pages and panels