[s2e2] The Eyes -

It is revealed that the Ice King is inside the horse costume, spying on Finn and Jake to learn their "secrets to being happy". Viewing Context

You can find this episode on streaming platforms like or for purchase on the Apple TV Store and Amazon Prime Video. List of important adventure time episodes - GitHub Gist [S2E2] The Eyes

Finn and Jake are exhausted and just want to sleep, but a strange, googly-eyed horse is staring at them from outside the Tree Fort. Their increasingly desperate attempts to get rid of the horse (including playing a lullaby and disguising themselves) fail until they discover it’s actually a costume. It is revealed that the Ice King is

"Loyalty to the King" (S2E3) — A highly recommended episode for Ice King's character development. Where to Watch Their increasingly desperate attempts to get rid of