Finn and Jake find themselves in the middle of a secret war when they inadvertently take out Peppermint Butler's secret agent, Candy Bar! There is something amiss with the King of Ooo and the weird bears that he's hanging out with. It's up to Finn and Jake to get to the bottom of the King's dastardly plot! ... If only they weren't being accused of treason in the process.
Abigail knows helping Claude find his way home won't be easy (goodbyes never are), but just as the two best friends set off on their journey, the Shadow Men put their top and most dangerous agent on the job of tracking the missing yeti down.