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).

巴斯特表面上对半身不遂的妻子珍妮关怀备至、表现得情深义重暗地里却和他的秘书安娜有染。巴斯特经常暗中动手脚使珍妮的轮椅发生意外，所幸珍妮吉人天相、有惊不险。巴斯特雇用特别护士全天候照顾珍妮表示他的关切。护士琳恩的白色制服背后却有许多不可告人之秘，其来意也耐人寻味。珍妮无意间查得琳恩的来历，得知琳恩将病人害死获取大笔奖金的惊人手法立刻告知巴斯特实情，不料巴斯特竟与琳恩洽谈合作……

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.

Due to their possession of an ancient mystic book, four friends are attacked by a demon while on a picnic and find themselves pitched into a world of evil that overlaps their own. The film was originally made in 1967 by Dennis Muren as The Equinox: Journey into the Supernatural. Jack Woods was hired to shoot additional footage and expand on Muren's work.

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.