A New York University professor returns from a rescue mission to the Amazon rainforest with the footage shot by a lost team of documentarians who were making a film about the area’s local cannibal tribes.

A group of people are trapped in a West Berlin movie theater infested with ravenous demons who proceed to kill and possess the humans one-by-one, thereby multiplying their numbers.

An American writer in Rome is stalked by a serial killer bent on harassing him while killing all people associated with his work on his latest book.

A group of tenants and visitors are trapped in a 10-story high-rise apartment building infested with demons who proceed to hunt the dwindling humans down.

A young man returns from Rome to his sister’s satanic New York apartment house.

A killer stalks a composer staying at a posh Tuscany villa while writing the score to a horror film which has an incriminating clue to the killer’s identity.