Planet of Vampires
A commercial cargo-hauler spacecraft responds to a call from the Demeter from a nearby planetoid, and finds an planet shrouded in eerie mists. The Demeter's crew have undergone a frightening transformation into the undead. At the center of all this strangeness is a weirdly earth-like castle and its master.
Inspirations: Planet of Vampires, Alien, and the Star Trek episode "Catspaw."
The Creepy Castle
Teenagers returning from Spring Break have their car break down in an eerie fog somewhere in Appalachia. Going the the forbidding European-style castle for help seems like a good idea...
Inspirations: any number of horror films including Texas Chainsaw Massacre; Scooby Doo, and for more of a tripped out euro-feel, things like Nuda per Satana and Requiem pour un Vampire.