Night of the Bloody Apes

“Half man, half beast, all horror”

In 1969 Mexico, Dr. Krallman (José Elías Moreno) has a son, Julio (Agustín Martínez Solares), whose illness no ordinary treatment can reach. So the surgeon turns to an operation nobody has attempted, putting the heart of an ape into the boy's chest. René Cardona directs, and what depends on it is Julio's life, along with the safety of anyone Lt. Arturo Martinez (Armando Silvestre) is sworn to protect.