The Creeps

"The Creeps" is the twelfth episode in season three of Adventure Time.

Synopsis
Finn and Jake receive an invitation to a masquerade dinner. It turns into a whodunit as guests start to meet their demise.

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 Beemo inside. They discover a note on CB'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. CB tries to leave, but as he tries to open the door the lights flicker and when they come back on, there is nothing left of him but a skeleton.

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

Jake suggest they get candles in case the lights go out again, which they do. He and Beemo head into the basement where Beemo disappear. Everyone panics and they hear LSP screaming in the bathroom, only to find out she was using it.

They go to the dining room where they begin to point fingers at each other. Jake accuses LSP 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 PB agreeing with him, causing her to be accused of being possessed (It as at this tme LSP continually interupts the conversation to tell them tha she broke up with Brad because he kissed her on the mouth and she wasn't ready for that and Brad claimed she wasn't ready for him.)

Finn then asks PB to recite what he wrote her two years ago as a birthday card but she denies, saying "I can't remember that." (And Finn replies sadly "I do."). Then a long tube of light passes through the roof and through PB, causing her to melt. It also engulfs LSP and puts her in a painting. Finn then admits that this was a prank, but this wasn't part of it. Finn checks the closet where CB and Beemo are supposed to be hiding, but instead find their scatter remains. Finn runs to an upper room but Jake is engulfed by the light. Then out of nowhere a monster appears and tries to get Finn, but he escapes by breaking through a wall.

In the observatory, Finn is cornered by the light, only to find out that it's Jake with Lady Rainicorn with all the guests in her body. Jake reveals that he knew about the Finn's plan for months and set this up with Lady Rainicorn. Finn asks about the monster he saw and Jake believes he was just imagining it out of fear and they leave (LSP admits that she is now ready for Brad). 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.

Characters

 * Finn
 * Jake
 * Princess Bubblegum
 * Lumpy Space Princess
 * Cinnamon Bun
 * Beemo
 * Lady Rainicorn
 * Mansion Ghost

Trivia
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 * This episode is scheduled as part of Cartoon Network's Halloween-themed programming, and is "Halloween-appropriate" according to Adam Muto.
 * The concept of this episode appears to echo the similarly themed "Mystery Train," which is Iinfluenced by classic murder mysteries from works such as Agatha Christie.The opening Title page may also be a referance to the game Clue because a few of the murder weapons various guests hold resemble that of the game and how the characters dress.
 * The commercial for this episode aired while the Regular Show Halloween Special was on. It showed Cinnamon Bun reaching for a door handle and getting electrocuted, and wasn't seen after in the rest of the commercial, except in a seperate commercial where Finn opens a closet door and finds what looks like Cinnamon Bun's parts on the inside walls.
 * On the same commercial, Finn appears to be the same height as Princess Bubblegum. The reason for this has been suggested by the Adventure Time staff to be an animation error, or Finn may be wearing lifts.
 * On the same commercial, A spirit is seen going through Princess Bubblegum, causing her to melt.
 * On the same commercial, LSP has a higher-pitched voice. This may be because she might be dressed as a singer and is trying to sing what she speaks. Although, throughout the rest of the episode, her voice is normal.
 * On the same commercial, Finn and Jake are seen gasping and looking at what appears to be LSP trapped in a painting.
 * The titlecard appears to have everyone with some sort of weapon and glacing at someone as if they were about to murder them. This could be a reference to the game "Clue" where there are different characters and different weapons; with Cinnamon Bun being the victim of a murder.
 * In this episode, LSP references breaking up with Brad (Trouble in Lumpy Space), and Jake references Finn's birthday party (Mystery Train).