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A 1963 Japanese horror film directed by Ishirō Honda. The film stars Akira Kubo, Kumi Mizuno and Kenji Sahara. Partially based on William Hope Hodgson's short story "The Voice in the Night", it centers on a group of castaways on an island who are unwittingly altered by a local species of mutagenic mushrooms.

The film was released directly to video in the United Kingdom as Fungus of Terror and an abridged version aired on television in the United States with the title Attack of the Mushroom People.