|"Adventure Time 5: The Psyhco Returns"|
| Season Movie, Episode 5|
| Written &|
"Adventure Time 4: The Revenge of the Dark Princess"
"Adventure Time 6 : Creepy Fears"
Adventure Time 5: The Psyco Returns is a sequel to Adventure Time: The Movie, Adventure Time 2: Friendship is Magic, Adventure Time 3: Heaven or Hell? and Adventure Time 4: The Revenge of the Dark Princess from Warner Bros. Pictures and Cartoon Network Studios. It has four sequels to it: Adventure Time 6 : Creepy Fears, Adventure Time 7: The Legend of Marsha, Adventure Time 8: Super Finn & Mario & Adventure Time 9: Adventure X.
Finn, Jake, Marsha and Hunson Abadeer must foil the plans of Psyco Marsha, who seeks revenge.
- Hunson Abadeer
- Psyco Marsha
- Jermey Shada as Finn the Human
- Roger Craig Smith as Older Finn the Human
- John DiMaggio as Jake the Dog
- Mathison Chicetawn as Princess Marshalia Christopher Abadeer the Fourth and Psycho Marsha
- Martin Olson as Hunson Abadeer
- This is Psycho Marsha first and last appearance in the 06civic68pa movie series.
- Psycho Marsha's personality is similar to Pinkie Pie's from Cupcakes.
- Psycho Marsha's insanity is a continuation from the special The Rise of Insanity.
- Psycho Marsha's suggestion to Marsha that their only difference is 'one bad day' is a reference to a line said by the Joker in The Killing Joke, as well as what Scrouge suggested to Sonic, where the villain states that all it takes to drive a man to insanity is 'one bad day'.
- Marsha has seemed to have grown more independent ever since "The Secret Sister" as seen in Her and Hunson's usual fights.