What Was Missing

"What Was Missing" is the tenth episode of season three of Adventure Time.

Synopsis
The guys take on a Door Lord who steals Jake's blanket, Finn's piece of Princess Bubblegum's hair, Beemo's controller, and items from both Princess Bubblegum and Marceline. In order to catch the thief, the group must sing as a "genuine band" to open the door he escaped through.thumb|right|300px|"What Was Missing" Animaitc

Plot
As seen in the preview, Finn, Jake, PB, Marceline and Beemo must battle a door lord to take back their belongings that were stolen by him.

Characters

 * Finn
 * Jake
 * Marceline
 * Princess Bubblegum
 * Beemo
 * Door Lord

Songs

 * I'm Just Your Problem
 * A Song About Noodles

Trivia

 * This episode was formerly titled "Door Jam." Adam Muto confirmed that it was the working title.
 * Finn still has the wad of Princess Bubblegum's hair he got in "To Cut a Woman's Hair."
 * As of the preview, every main character except Lady Rainicorn, Lumpy Space Princess and Ice King appear in this episode.
 * According to the lead character designer Andy Ristaino, this episode is going to be a musical.
 * This is also likely the reason its former title was Door Jam, referring "jam," which has to do with music. Also Jam often means to be stuck in a tight situation or lock in place or Jelly.
 * In the storyboard it says Finn "slaps lyrics on his backpack." This may be linked to the fact that this episode is a musical.
 * This is the first episode ever to be a musical.
 * There is going to be a guest voice. It is unknown who, perhaps the Door Lord, but he has done voices for the show before As You Know The Door Lord Speaks in Mumbles in some sort.
 * As seen in the preview, the oven, range hood, and cabinets in Marceline's house are white instead of red. Marceline may have sucked the red coloring out of them at one point, like how she sucked the red out of the man's bowtie in "Henchman," giving it a new white color.
 * The title card was designed by Michelle Xin and painted by Martin Ansolabehere.