Matango (1963)
This is a bad one! But we love it for its cheesiness. A Japanese movie in which a group of castaways on an island are unwittingly altered by a mutagenic fungus. Directed by Ishiro Honda, who is best known for directing the original Godzilla movie, this film was almost banned upon its release, because of its depiction of characters that resembled victims of the Hiroshima and Nagasaki atomic bombings.