What Was Missing
Season 3, Episode 10
What Was Missing
Air date September 11, 2011
Written by Adam Muto and Rebecca Sugar
Directed by Larry Leichliter
Episode guide
"Fionna and Cake"
"Apple Thief"

What Was Missing is the 10th episode of Season 3 of Adventure Time. It first aired September 26, 2011.


After their belongings are stolen by a Door Lord, Finn, Jake, Princess Bubblegum, Marceline, and BMO must open a door that will only open to a genuine band.


  • This is the episode that started the whole band.
  • The title of the episode has a confusing meaning, because it could mean that something was missing in the songs that they were singing, or the fact that the Door Lord was stealing everything, and making those things missing.
  • This episode reveals that Princess Bubblegum and Marceline have a "friendly rivalry".


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