A gang of vicious young punks break into the house of an elderly couple, terrorize, and then murder them. Suddenly, the clocks in the house begin to run backwards, and the dead come back for revenge!

In the small New England town of Dunwich, a priest commits suicide by hanging himself in the church cemetery which somehow opens the gates of hell allowing the dead to rise. Peter, a New York City reporter, teams up with a young psychic, named Mary, to travel to the town where they team up with another couple, psychiatrist Jerry and patient Sandra, to find a way to close the gates before All Saints Day or the dead all over the world will rise up and kill the living.

A deranged killer lives in the basement of an old mansion and pops out occasionally to commit grisly murders that include be-headings, ripped throats, and stabbings with a fireplace poker. The killer needs fresh body parts to rejuvenate his cells. He also has maggots for blood.

The cellar of an old hotel is built on top of the door to the beyond. Bloody zombies roam there. A young woman who is heir of the hotel wants to restaurate it. She is confronted with strange events. A painter has a lethal fall, the plumber vanishes and her friend breaks his neck. When she escapes to the hospital of a friendly doctor she doesn't know what a nightmare is waiting there...

An archaelogist opens an Egyptian tomb and accidently releases an evil spirit. His young daughter becomes possessed by the freed enity and, upon arrival back in New York, the gory murders begin.