Night of the Bloody Apes is the title of the 1972 English language version of the 1969 Mexican horror film La horripilante bestia humana ("The Horrible Man-Beast"), also known as Horror y sexo ("Horror and Sex") and as Gomar—The Human Gorilla. The film was directed by René Cardona and is a remake of his 1962 film Las Luchadoras contra el medico asesino ("The Wrestling Women vs. the Killer Doctor"; U.S. title Doctor of Doom), the first in a series of films blending elements of the lucha libre and horror genres.

Plot

Mad scientist Dr. Krellman attempts to cure his son's leukemia by doing a heart transplant, replacing his son's heart with a gorilla's. The result of the operation transforms Krellman's son into a deformed and mutated man-ape hybrid, taking on the characteristics of the organ's donor, who immediately goes on a bloody rampage.