Director
Jack Hill
DIRECTOR
Juan Ibáñez
José Luis González de León
Writer
WRITER
Karl Schanzer
Luis Enrique Vergara
Stars (in credits order)
Boris Karloff
Prof. John Mayer
Enrique Guzmán
Dr. Paul Rosten
Christa Linder
Laura
Maura Monti
Dr. Isabel Reed
Yerye Beirute
Thomas
Tere Valez
Nancy
Griselda Mejía
Prostitute
Sergio Kleiner
Alien
Rosángela Balbó
Martha - mayor's wife
Mariela Flores
Deaf-mute victim
Tito Novaro
Gen. Nord
Sergio Virel
Villager
Nathanael León
Victor Jordan
ACTOR
Julián de Meriche
Visiting dignitary
Carlos León
Arturo Fernández
Victorio Blanco
Old Villager Carrying Cross(uncredited)
Ángel Di Stefani
Visitor(uncredited)
Jorge Fegán
Officer(uncredited)
Patricia de Morelos
Villager(uncredited)
