|Season 4, Episode 17|
|Air date||August 16, 2012|
|Written by||Tom Herpich|
|Directed by|| Nate Cash (creative)
After Finn's sock goes missing, BMO goes on a mission to find it.
The episode starts with BMO playing himself, and Finn says something to Jake about his missing sock, while Jake is putting on make-up. Jake starts to get all sarcastic, saying that everyone should stop what they're doing to help look for Finn's sock. This is where the episode turns black and white. BMO starts to have an over-voice, talking about the mystery, and how he could solve it.
- This is the only episode of Adventure Time that is partially in black and white.