The Creeps

Synopsis
Finn, Jake, and some friends attend a dinner with a mysterious host. However, the host then reveals himself as a murderous ghost that will possess the body of one guest to kill everyone else. The night turns from a masquerade party into a terrifying who-dun-it as the guests start to get murdered one by one.

Plot
Finn and Jake headed to a castle for a party they were invited to by an unknown host. Outside the door is a box of disguises for them to wear. When they head inside they find Princess Bubblegum, Lumpy Space Princess, Cinnamon Bun, and BMO inside, under the guises of Lady Quietbottom (Princess Bubblegum), Duchess Gummybuns (Lumpy Space Princess), Guy Farting (Cinnamon Bun), and Professor Pants (BMO), respectively. Finn and Jake receive the names Prince Hot-bod and Randy Butternubs. They discover a note on Cinnamon Bun's back. Finn reads it telling them that their host is a ghost that will take over one of their bodies and kill the rest of them. Cinnamon Bun tries to leave, but as he tries to open the door, the lights flicker. When they come back on, there is nothing left of him but a skeleton.

Jake thinks Finn planned this from his birthday prank but Finn denies it. Finn brings the remaining party guests to the staircase and has BMO take pictures of them with its ghost-detecting gear to see who is possessed. Jake doesn't blink when his pictured is taken, making everyone believe he is the ghost until BMO confesses it has no ghost detection gear and just likes taking pictures.

Jake suggest they get candles in case the lights go out again, which they do. He and BMO head into the basement where BMO disappears, having been captured by what appears to be a long worm-like white ghost. Jake then runs upstairs and tells Finn and Princess Bubblegum that the ghost has captured BMO but Finn accuses him of being the ghost. Everybody panicked when they heard Lumpy Space Princess screaming from the bathroom.(which turns out she was using it).

They go to the dining room where they begin to point fingers at each other. Finn asked Jake a question that only the real Jake knows. After Jake correctly answers the question, Jake accuses Lumpy Space Princess and that she has to tell them why she broke up with Brad to prove herself. She refuses on the grounds that they didn't know what happened between them. Finn wanted to tie her up with Princess Bubblegum agreeing with him, causing her to be accused of being possessed (Lumpy Space Princess then continually interrupts; confessing that she broke up with Brad because he kissed her on the mouth and she wasn't ready).

Finn then asks Princess Bubblegum to recite what he wrote her two years ago as a birthday card, but she refuses because she could not remember. Then the long worm-like thing-the 'ghost'-passes through the roof and through Princess Bubblegum, causing her to melt. Finn checks the closet where Cinnamon Bun and BMO are supposed to be hiding, but instead finds their splattered and scattered remains draped all over the walls and celing of the closet. Finn then admits that this was a prank, but that wasn't part of it. The 'ghost' also engulfs Lumpy Space Princess and she tries to call her parents but then the lights start to flicker and the ghost captures her and puts her in a painting. Finn and Jake tries to escape but the doors were locked. Then they try running upstairs but Jake was captured. Finn then hides in a room. Out of bookshelves, the Ghost Lady appears and tries to get Finn but he managed to escape by breaking a hole in the wall. In the next room, the floor bursts open, a picture of crows on the wall comes alive and releases crows into the room. The floor separates completely into a mouth shape, and the furniture begins to try and eat him, and Finn flees this room and up a nearby stairwell into the observatory.

The observatory is surrounded by ocean, which crashes up against the base of the building in huge waves. The light rises through the floor, finally cornering Finn, when the light takes the sheet off its head and herself to be Lady Rainicorn with all the guests fused in her body, and Jake on her back. Jake reveals that he knew about Finn's plan for months and 'flipped the script' with Lady Rainicorn. Finn asks about how PB melted (it was a wax dummy), and then the monster he saw and the house coming alive. Jake believes he was just imagining it out of fear but Finn denies it. Jake then thinks its just another joke. After they leave on LR, Finn flashes back to the monster he saw and decides to put it in "the vault" and forgets about it.

Major characters

 * Finn/Prince Hotbod
 * Jake/Randy Butternubs
 * Princess Bubblegum/Lady Quietbottom
 * Lumpy Space Princess/Duchess Gummybuns
 * Cinnamon Bun/Guy Farting
 * BMO/Professor Pants
 * Lady Rainicorn (as the ghost)

Minor characters

 * Ghost Lady
 * Snail

Mentioned

 * Lumpy Space King
 * Lumpy Space Queen
 * Brad

Trivia

 * Finn the Human or Prince Hotbod mentions about "Elevator Dreams" when he was asking Jake, A story which was created by Roald Dahl.
 * This is a Halloween Special, along with "From Bad to Worse ".
 * A ruined skyline can be seen outside the mansion, which is an example of the effects of the Mushroom War.
 * Cinnamon Bun may has feelings for Lumpy Space Princess, as demonstrated when he says, "Now's my chance," when he hears that she has broken up with her boyfriend
 * At the top of a staircase, a portrait's plate reads: 8•18•12. This (August 18, 2012) is the date background painter Santino Lascano was married.
 * On the bottom of a painting, it says "La Caza Del Zorro" which is Spanish for "Fox hunting."
 * One could tell Princess Bubblegum was a dummy because she never moves when Lady Rainicorn comes in as the ghost.
 * When the camera focuses on the dummy of Princess Bubblegum, one of her ears is clearly visible.
 * Finn's mask is a fox mask, Jake's mask is a classic green eye-mask, Princess Bubblegum's mask is a swan mask, Lumpy Space Princess's mask is a red triangular mask, BMO's mask is a bear mask, and Cinnamon Bun is not wearing a mask; although he is wearing a mustache, a top hat, and a monocle.
 * In the Adventure Time With Finn and Jake: Righteous Rules For Being Awesome book, it mentions it was Jake's birthday.
 * On the painting where a lady is hugging a bull, the portrait plate reads MAYO.11.

Episode connections

 * Jake's trick in "Mystery Train" is alluded to at the beginning of the episode. Also, at the end of the end of the episode, Jake refers to the same events by saying "I gotcha, dude! Two for two!"
 * Brad from "Trouble in Lumpy Space" is mentioned. Lumpy Space Princess reveals why she broke up with Brad in the first place.
 * Ghost Lady briefly appears in the episode "King Worm" as a subconcious fear.
 * The mansion resembles the one that Big Destiny and the Destiny Gang live in in "Finn the Human."

Errors

 * When Lumpy Space Princess enters in the dining room, there are eight plates on the table, but in the following shot one of them disappears.
 * When Finn is accusing Princess Bubblegum of trying to avert suspicion by blaming Lumpy Space Princess, Finn and Princess Bubblegum appear to be the same height.
 * When Jake was stretching his arms to trap Princess Bubblegum, his sleeves stretched with it.
 * When Finn, Jake and Lumpy Space Princess cover themselves to avoid the ghost, they are at the opposite end of the table.
 * Right after Princess Bubblegum melts, the white and black colors in Jake's eyes get switched for a couple frames.
 * When Lumpy Space Princess gets sucked into the painting she drops her phone but in the painting she gets her phone back.
 * In the painting, Lumpy Space Princess is near the end of the line of the dogs, but when the camera focuses on her, she is next to the fox.
 * When Finn and Jake are trying to get out to the door, there is one scene that Finn's gloves are gone.
 * When BMO took pictures of Lumpy Space Princess, Princess Bubblegum, and Jake BMO processed four pictures when it only took three pictures.
 * When BMO and Jake are checking out the basement, out of Finn's earshot, they act as if neither of them know what is going on, when they obviously do.
 * This is made more strange when BMO is clearly taken by Lady Rainicorn, who Finn was not using as part of his plan, although later Finn says that he had planned on BMO being taken. This means that his original plan for taking BMO could not have gone ahead.

Cultural references

 * This episode is done in a Whodunit mystery style, where strange murders occur within a confined space, like the murder mystery book And Then There Were None , by Agatha Christie, or The Mystery of the Yellow Room, by Gaston Leroux, who wrote The Phantom of the Opera.
 * The note on the box of Finn and Jake's masks said Wear Me, which is similar to the Alice in Wonderland phrase that was written on the cake and drink: Eat Me & Drink Me.
 * The title card may also be a reference to the game Clue, since the various murder weapons the guests are holding and their outfits resemble those of in the game. Princess Bubblegum has the knife, Lumpy Space Princess has the rope, Jake has the gun, Finn has the fireplace poker, and BMO has the candlestick.
 * The opening scene, costumes, and much of the interior of the mansion are drawn in the pseudo-Victorian style of the late Edward Gorey, a prolific author/cartoonist best known to the general public as the creator of the animated sequence opening the PBS Mystery series and his darkly humourus books.
 * The ghost or demon appearing near the end is drawn and painted in the style of traditional Japanese 'ghost paintings'.

Production notes

 * This episode was scheduled as part of Cartoon Network's Halloween-themed programming.
 * On the On Demand synopsis it said the invite was from Count Creepystein, but in the episode, they don't know what the host's name is.