Ep 12. The Creeps

The Creeps is the twelfth episode of the third season of Adventure Time with Finn and Jake. The episode starts with Finn and Jake arriving at a fancy mansion for a party that they were invited to. However, the party turns out to be a murder mystery dinner party and Finn and Jake are to play along as the characters in the story.

The host of the party is a strange, old man named "Choose Goose," who has a penchant for mystery and drama. The guests include the Baroness, the Duchess of Nuts, the Earl of Lemongrab, and a few other characters from the Land of Ooo.

Throughout the party, strange things start to happen, and the guests begin to die one by one. It soon becomes apparent that someone is behind it all, and Finn and Jake, along with the remaining guests, must figure out who the culprit is and put a stop to their plans.

As the night progresses, the party becomes darker and more bizarre, with secret passageways and hidden rooms revealing clues to the mystery. Finn and Jake encounter a number of odd characters, like a ghostly owl and a living door, as they search for answers.

Eventually, Finn and Jake unravel the mystery and unmask the murderer, revealing that the whole thing was a trap set by Choose Goose, who was seeking to steal a valuable diamond from the guests. In the end, all the guests make it out alive, and Finn and Jake are hailed as heroes, having saved the day once again.

The Creeps is an entertaining and offbeat episode that combines elements of mystery and horror with Adventure Time's trademark sense of humor and whimsy. It's a great showcase of the show's unique style and storytelling, and is sure to delight fans of the series.