This may have already been suggested, but perhaps a horror-type scenario loosely inspired by the 1970s television movie "Satan's School for Girls." A heretic professor at a religious women's college is corrupting the souls of his young female students by the use of satanic witchcraft. There are opportunities for parasite and tentacle scenario's as well as possibly even throwing vampires and voodoo into the mix. A series of short features could be done each set at the school where the teacher is corrupting one or more students and then, as the series progresses, you could have the corrupted students helping the professor to corrupt others at the school.