Don't Open the Window (1974)

a.k.a. "Let Sleeping Corpses Lie"/ "Zumbi 3" / "Non si deve profanare il sonno dei morti" (original title)

Brought about by the use of a new, radiation emitting device intended to destroy insect's nervous systems, the dead are brought back to life due to the jump start the radiation provides to their nervous systems. After the murder of a woman's estranged husband, police suspect the woman, her sister and a relative stranger (who was only along because the sister had run into his motorcycle only hours prior) of involvement in the murder, and as the bodies begin to accumulate the police chief becomes more and more convinced of their involvement.

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Children Shouldn't Play with Dead Things (1973)

The story focuses on a theatre troupe, led by Alan. He is a mean-spirited director, who travels with the others by boat to a small island for buried criminals to have a night of fun and games. Once on the island Alan tells his group—he calls them his "children"—numerous stories relating to the island's history and buried inhabitants. At midnight using a grimoire, Alan begins a séance to raise the dead after digging up the body of a man named Orville Dunworth (Seth Sklarey). Though the original intent of the ritual may have been solely as a joke, Alan appears disappointed that nothing happens. Afterwards the party continues and Alan goes to extremes to degrade the actors, using the corpse of Orville for his own sick jokes. Then, however, animated by the fell ritual, the dead return to life and force the troupe to take refuge in the old house. Unfortunately for the group, the dead get their revenge, and in the movie's closing credits we see the group of corpses boarding Alan's boat with the lights of Miami in the background.

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Zombie (1979)

 

a.k.a. '"Zombi 2"

A zombie is found aboard a boat off the New York coast which belongs to do a famous scientist. Peter West, a journalist, travels to the Antilles with Ann, the daughter of the scientist. On the way, they meet with with Brian, a ethnologist, and Susan. When they arrive at Matul Island, they find Dr. Menard, and discover a terrifying disease which is turning the islanders into horrifying zombies which devour human flesh and seem indestructible.... 

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The Beyond (1981)

a.k.a. "...E tu vivrai nel terrore! L'aldilà"

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... 

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