Adventure Time: What Was Missing

Adventure Time: What Was Missing
Cartoon Network
September 26, 2011
Cartoon
DVD
B

Finn, Jake, BMO, Princess Bubblegum, and Marceline (who is a vampire I guess) team up to fight the Door Lord (Steve Agee), who steals their most prized possessions, although "the real treasure is friendship."  And they have to form a band, which means lots of music.  Ward, Banker, McHale, Muto, Osborne, and Sugar wrote the script.