Castle Halloween Bash prompts/fic starters
"Castle? What is that AWFUL smell?" Kate asked as she walked into the kitchen. Then she saw the cauldron full of bubbling purple liquid.
"There," said Castle, as he handed Kate their finished jack-o-lantern. "Just set it out in the hall."
"Ugh. I think I've eaten too much Halloween candy." (Any character)
A teenage Kate Beckett is stuck at home all Halloween night after being told by her parents that she was too old for trick-or-treating.
The annual Castle Halloween party. (Any season)
The team investigates a murder on the set of a horror film.
It's Halloween night and the women of the Castle household want to watch a Twilight marathon.
Castle, Beckett, and the gang stuck in New York City while it’s attacked by a giant monster (e.g. Cloverfield or any Godzilla movie).
While working a case, Castle and Beckett somehow find themselves stopping overnight in a small town upstate. But nothing is as it appears in this quaint small town. (any season)
Invasion of the Bodysnatchers. (Any season, any character)
Caskett are stuck in the Bermuda Triangle.
It's the zombie apocalypse! Who will survive!? (Any season, any character)
Something extremely un-scary is terrorizing Beckett, yet it's completely freaking her out. Author's choice if it turns out to be Castle's "I'll get you back" prank.
The gang are all teenagers, going out for some trick-or-treating shenanigans.
The 12th Precinct's elevator is possessed. (Any season, any character)
It turns out the house in 4x06 - "Demons" really was haunted.
Take any horror film and make Castle and Beckett the main characters.
“Um, so yeah... I’m a vampire. But don’t worry, I promise to buy you dinner before I bite you.” (Any season, any character)
"It’s going to be a full moon tonight. I need you to chain me to the bed. And no, this isn’t about some kinky sex.” Werewolf AU.
Undead Again AU: The killer really was a zombie.
Castle and Beckett get stuck in a crawl space. (any season)
Wrapped Up In Death AU: The Mummy’s curse was real.
Caskett taking Lily and the twins Trick-or-Treating for the first time.
Road trip where car unexpected breaks down in the middle of nowhere.
Caskett have a horror movie marathon.
Stranger Things Caskett-style.
Ghost!Castle or Ghost!Beckett
Homage to The Nightmare Before Christmas
Time Of Our Lives AU where the other universe is populated by the evil versions of the Castle gang.
The Blame Game has more of a horror tinge to it, like Saw
All the classic literature/movie monsters are real.
R.L. Stine/Goosebumps tribute.
AU where Caskett live in a steam-punk world.
Castle and/or Beckett woke up to hear knocking on glass. At first, he or she thought it was the window until he or her heard it come from the mirror.
She asked why I was breathing so heavily. I wasn't.
I awoke to the sound of the baby monitor crackling with a voice comforting my firstborn child. As I adjusted to a new position, my arm brushed against my spouse, sleeping next to me.
Caskett are woken up by Lily telling them there’s a monster under her bed.
Caskett alone in the woods.
Either Castle or Beckett buried alive while the other tries to save them.
Creepy Serial Killer stalking either Beckett or Castle (Author’s Choice).
Castle, Beckett, Ryan, and Esposito are drawn to a small town to enter a bizarre contest.
Pre-Caskett. Beckett becomes worried when she notices the neighborhood cats begin following her.
Poltergeist tribute with Caskett, Lily, Jake and Reece.
Either Castle or Beckett (Author’s Choice) is possessed by an evil spirit.
Caskett attends a séance.
A creepy “fog” descends on the city.
Castle inadvertently offends a witch, who puts a hex on him. Beckett doesn’t believe him, until the “accidents” start getting more serious. Pre or Post Caskett, Author’s Choice).
Beckett helping Lily pick out a Halloween costume (either child Lily or teenage Lily, up to author)
Cuffed, with a darker edge to it.
Castle wakes up to an empty loft. When he ventures outside, New York is eerily silent and devoid of life. Across town, Beckett wakes up to a similar situation in her apartment. (any season)
Vampire Weekend, where Beckett’s secretly a vampire.
Gremlins have infested the 12 precinct.
The Castles host a game night, during which the board game comes to life, similar to Jumanji.
Caskett taking their kids trick or treating.
Beckett and Alexis team up to pull a Halloween prank on Castle.
Caskett check in to a bed and breakfast in upstate New York for a weekend getaway. After one night, Castle insists the place is haunted.
AU of Time Of Our Lives, where everyone in the other universe Castle travels to is evil. Think similar to the mirror universe in Star Trek.
Castle or Beckett (author’s choice) is the Pumpkin King/Queen.
A murder in a hay-bale maze.
Pre-Series, Castle and Beckett meet at a mutual friend’s Halloween party and hook up.
In Vampire Weekend, Beckett actually attends his party in a costume. (author’s choice whether or not it’s a sexy costume)
Castle or Beckett (author’s choice) is immortal.
During their first night in Always, Castle discovers Beckett’s an alien... similar to Species series. Author’s choice on a horror or happy ending.
After a night of wild passion, Castle and Beckett awake the following morning naked in bed, and with no memory of each other. All they can find is a strange, creepy letter. (author’s choice what letter says)
Ghosts are popping up around New York. Who are you going to call? Caskett!
Either Beckett or Castle (Author’s Choice) is actually a supernatural being.
The Headless Motorcycle Rider
What if it was all a dream?
In Knockout/Rise, Beckett does die, but she comes back as a zombie.
Pre-Series. Driving back from the Hamptons late a night, Castle stops to pick up a hauntingly beautiful hitchhiker named Kate. As they talk, she’s vague about her life, making him worry she’s a serial killer. Author’s choice whether Kate reveals she’s a cop or let’s him believe she’s a serial killer.
Castle dies in Time of our Lives, Beckett travels to the underworld to bring him back (inspired by Greek myth)
A flying saucer lands in Central Park.
Castle and Beckett team up with FBI Agents Mulder and Scully to solve a case.