Adventure Time - Season 5 - Eps 10: Little Dude
Finn's hat comes to life and becomes evil after it is touched by a wizard. Finn, Jake, and the wizard track the hat down, and manage to turn the hat good.
About Adventure Time

Title: Adventure Time
First Air Date: 2010-04-05
Last Air Date: 2018-09-03
Status: Ended
Rating: 8.494/10 (from 2828 votes)
Language: EN
Seasons: 11
Total Episodes: 279
Network: Cartoon Network
Genres: Animation, Comedy, Sci-Fi & Fantasy
Production Companies: Frederator Studios, Cartoon Network Studios
Synopsis
Unlikely heroes Finn and Jake are buddies who traverse the mystical Land of Ooo. The best of friends, our heroes always find themselves in the middle of escapades. Finn and Jake depend on each other through thick and thin.
Cast

Jeremy Shada
Finn the Human (voice)

John DiMaggio
Jake the Dog (voice)

Tom Kenny
Ice King (voice)

Hynden Walch
Princess Bubblegum (voice)

Olivia Olson
Marceline the Vampire Queen (voice)

Niki Yang
BMO / Lady Rainicorn (voice)

Pendleton Ward
Lumpy Space Princess (voice)

Polly Lou Livingston
Tree Trunks (voice)