
02/09/1965
After a young man is killed in an unexplored subterranean cavern and his girlfriend driven mad by something she saw there, a track found at the scene cannot be identified with any known animal and thus a scientific expedition is launched to find out just what it is that is living there.

José Elías Moreno
as Profesor Díaz

Carlos Cortés
as Dr. Pena

Kitty de Hoyos
as Hilda Ramírez

David Reynoso
as Jaime Rocha

Columba Domínguez
as Laura Ponce

Javier Solís
as Dr. Manuel Ríos

Carmen Molina
as Julia

Ramón Bugarini
as Apolinar

Carlos Nieto
as Novio de Julia

Marco Antonio Arzate
as

Armando Acosta
as Gerente de gruta (uncredited)

Roberto Meyer
as Padre de Julia (uncredited)

Inés Murillo
as Turista (uncredited)

Miguel Suárez
as Psiquiatra (uncredited)
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