After a disastrous adventure, Finn and Jake find themselves in Equestria, populated by colourful ponies, with Finn transformed into one too! After meeting the heroes known as the Mane 6, they get to know each other better, while something stirs in the Crystal Empire.

For Adventure Time: set after Come Along With Me. For My Little Pony: set after Season 7, but before My Little Pony: The Movie.