"Ketchup" is the name of the eleventh episode of the ninth season of the American animated television series Adventure Time.

The episode was written and storyboarded by Seo Kim and Somvilay Xayaphone, from a story by lead writer Kent Osborne, Jack Pendarvis, Julia Pott, Patrick McHale, Ashly Burch, and series showrunner Adam Muto.

Marceline assures the robot that the vampire threat passed months ago, and asks BMO to download the contents of an old USB drive.

However, the story gets highly exaggerated and surreal, involving a cat named Ted and a blue jay (voiced by J. G. Quintel).

"Ketchup" was written and storyboarded by Seo Kim & Somvilay Xayaphone, from a story developed by Ashly Burch, Patrick McHale, series showrunner Adam Muto, Kent Osborne, Jack Pendarvis, and Julia Pott.

[2] McHale—who had served as a storyline writer, storyboard artist, and creative director for the show in its first few seasons—wrote portions of BMO's first story with his son; the two also wrote the lyrics for the song that Finn sings in this segment.

"[11] The fairy-tale version of Marceline's mother is wearing a dress that recalls a bird cage, since the character "is sort of a prisoner of circumstance".