Deep within the woods and canyons of California, four teenagers happen upon an ancient book containing the secrets of a strange, malevolent world that coexists with that of mankind. This film was re-editted with additional footage and released as Equinox (1970).

Someone is killing off the female leads of the movie production "Bad Girls from Mars." The producers feel they should try to finish the film, even though they're making a lucrative amount from insurance payoffs, so they fly in European sex bomb Emanuelle as the new lead. Emanuelle immediately begins embarrassing the producers by leading a wild party life around town. Meanwhile the killings continue, and detectives try to stop the fiend responsible.

Five college women buy the old Hokstedter place for their new sorority house. They got it cheap because of the bloody incidents from five years before. They decide to stay in it for the night so they can meet the movers in the morning, but begin to get the creeps when the weird neighbor Orville Ketchum starts poking around. Shortly after the women take showers and consult a Ouija board they begin experiencing an attrition problem.

When a young girl dies mysteriously after being treated at a sex therapy clinic, her sister Kay goes undercover to find out who is responsible.

While doing the inventory for a lingerie outlet in a high rise office building, five attractive women are terrorized by a series of bizarre killings. They suspect that the strange janitor, who witnessed another series of killings six months previously, is at the bottom of the whole thing. Little do they know the real horror that they face in the end.