Finn and BMO are reading the news.
Finn: Check this out, BMO! Some other local dude has been drained of his blood with two teeth marks on his neck.
BMO: Oo! Says here that police have no idea what's going on.
Jake is heading out.
Jake: Gotta go. Me, Lady, and the pups were invited to Marceline's. She said she couldn't wait to have us and our precious blood for dinner or something like that. You know those wacky goths...
Finn: 'Kay. Just look out for those vampires that've been sighted lately... [shocked] wait!
Finn looks over at Jake.
Finn: Jake... you forgot your coat, dude! It's flippin' raining out there!
Jake: Oh, yeah. Thanks.
[Jake exits]
Finn: oh, and in a completely unrelated story, the last few people that Marceline invited for dinner have just mysteriously disappeared... weird.
BMO: I hope Jake doesn't go coincidentally missing like those other guys.
In the next scene, Jake, Rainicorn, and the pups are walking along a dark road with dead trees lining the sides, under a moon in a cloudy evening sky.
As they walk along the narrow road to the house, Marceline' head appears in the sky, a wavering ghostly image against the full moon. When they arrive at the house, Jake rings the doorbell.
The door creaks open, and the family walk in to the dark stone entrance hall. Marceline appears in a puff of smoke on some nearby stairs.
Marceline: Well, if it isn't my good friends, Jake and... um...
Jake seems to notice that Marceline's shadow seems to act independently of her body, and he becomes suspicious.
Jake: Something's strange... pups, did any of you guys toot? Be honest.
Jake Junior: Uh... Charlie did it!
Marceline seats her guests at one end of a long table while she takes the other end.
Jake: Ooo! Mac and cheese! [fancy] Very sophisticated.
Suddenly, a bunch of vampire bats fly over the table, screeching. They head over to Marceline, and land on the table in front of her. She starts petting them.
Marceline: Me and the bats have a lot in common. We both like blood... [whispering to herself] precious, precious blood...
Jake is becoming more certain something's terribly wrong. He tries sneaking away to investigate.
Jake Junior: Where are you going, Dad?
Jake: Uh... I need to go... to the bathroom. Yeah, that's it.
Jake runs past a few doors.
Marceline: You just passed the bathroom.
Jake: Uh, I'm a dog. I go outside.
Marceline shrugs her shoulders then continues eating.
Jake is wandering in a dark hallway.
Jake: Hmmm... what's wrong with this picture?
A stone gargoyle next to Jake blinks it's eyes a few times.
Gargoyle: I dunno.
Jake: Yeah, man... it doesn't seem too- wait.
Jake stares at the gargoyle for a few seconds.
Gargoyle: Hi.
Jake runs off screaming.
Jake runs down some stairs, still screaming, and soon ends up in what looks like a blood bank.
Jake: Marceline has her own blood bank? Well, what'd ya know?
Jake notices some coffins and shudders.
Jake: [scared] Gaaaaaaahhh...
The lids start to slide off the coffins, and zombies come out of them.
Jake: Lady, pups, Marceline, heeeelp!
One of the zombies grabs Jake's throat and strangles him.
Jake: [strangled] GAAAAK! GAAK! LAAAADYYYY!
Jake Junior walks into the room.
Jake Junior: Dad? [notices the zombies] DAAAAD!
Jake Junior attacks the zombie and manages to knock it over, saving Jake.
A zombie's hand rakes its claws along Jake's side, and he screams in fright. He and Jake Junior run off and run up the spiral staircase. On the way up, Jake Junior notices a screaming voice. It's an old man all the way in the back of the room being cornered by zombies.
OLD MAN: Aaaaah! Heeeelp meeeee!
Jake Junior runs past the zombies over to the scared man. She fights off the zombies, but is suddenly grabbed by the old man. The old man hisses at her, revealing his fangs.
Old Man: You fell for the oldest trick in the vampire book!
Jake Junior: Aaaah! Dad, help!
But it's too late. Jake already ran back to the dining room.
Jake runs up to the table to tell the others what happened.
Jake: [breathlessly] Marceline, Lady - wait, where's Jake Junior?!
Marceline: Jake, she's right here!
Jake Junior: [droning] Hello, faaaaamily. I just wandered off and got lost. But Marceline here found meeeee.
Jake: Oh. Glad to know everything's okay. Well, let's get back to eating.
Back home, Jake tosses and turns in his bed, unable to sleep. When he hears a scraping noise at his window, he opens his eyes and looks over at the window. Jake Junior and the other pups, now vampires, are floating outside the window with Marceline.
Jake Junior: Join us, Faaatheeer. It's aaaawesooome being a vaaaampire!
Marceline: It is, I've been a vampire for literally CENTURIES now!
Jake: Aaaaah, Finn!
Fin: Jake! How many times have I told you that you're only imagining the pups outside the win - oh, Glob!
BMO runs in.
BMO: Quick! We don't have much time! [holds a stake and mallet]
Marceline and the pups hiss at them. They all turn into bats and fly off quickly.
Jake: Finn, I've got to do something! Lady's totally going to freak if she finds out I let them drink blood after their bed time!
Finn: The only way to cure them is to kill the head vampire... who must be Marceline!
Jake: Kill my friend? B-b-b-but - [sighs] fine, if it'll cure the pups...
So the trio head off to Marceline's castle.
BMO: We finally made it!
Jake: But where are -
Marceline and the pups drop down from the ceiling and attack the three.
Jake: Gaaah! Bad pups! You are SO grounded!
BMO: Help!
Finn: Get off!
{Finn remembers the garlic he keeps in his backpack}
Finn: Wait... I always keep garlic in my backpack!
Jake stretches his hands into Finn's backpack, and grabs the garlic.
The vampires jump off of the trio, hissing at the garlic.
Finn: Don't make us do this, Marceline!
Marceline laughs menacingly at Finn.
Marceline: You don't have the guts to finish me off!
Finn: You're... [sighs] right. Jake, how can we kill her? She used to be our friend!
Jake: Friends, shmends, gimme the stuff!
Jake quickly snatches the garlic out of Finn's hands and throws it into Marceline's mouth, then stretches his hand over to her mouth and slams her mouth shut, making her swallow it.
Marceline: [choking on the garlic] H- f- j- k- y- [melts]
The next day at the tree fort, Finn, Jake, BMO, and the pups are eating breakfast.
Jake: So glad my pups are back!
Jake Junior throws her dinner to the floor, then hisses at Jake.
Jake Junior: I'm still a vampire!
Jake Junior, the rest of the pups, Finn, and BMO float up from the table and hiss at Jake.
Jake: Aaaaaah! Impossible! We eliminated the head vampire!
Finn: No, BMO's the head vampire!
BMO: It's always the one you least suspect! Now it's time to suck your blood!
Jake: NO!
Suddenly, everybody stops and looks at the screen. King Worm, Cinammon Bun, LSP, Marceline, the gargoyle, the zombies, the old man, Lady Rainicorn, Princess Bubblegum, and Peppermint Butler walk in. Everyone looks at the screen smiling.
Everybody: Happy Halloween!
The end.