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Directed by
René Cardona 
Jerald Intrator (new footage for US version) (uncredited)
 
Writing credits
(in alphabetical order)
René Cardona Jr.  story and adaptation
René Cardona  story and adaptation

Cast (in credits order)
José Elías Moreno ... Dr. Krallman
Carlos López Moctezuma ... Goyo
Armando Silvestre ... Lt. Arturo Martinez
Norma Lazareno ... Lucy Ossorio
Agustín Martínez Solares ... Julio Krallman (as Agustin Mtz. Solares)
Javier Rizo
Gerardo Zepeda (as Gerardo Cepeda)
Noelia Noel ... Elena Gomez
Gina Morett ... Woman in shower
rest of cast listed alphabetically:
Juan Fava ... El Físico Nuclear (uncredited)
Nathanael León ... Zoo security chief (uncredited)
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Produced by
Guillermo Calderón .... executive producer (as Guillermo Calderon Stell)
Alfredo Salazar .... producer (uncredited)
 
Original Music by
Antonio Díaz Conde 
 
Cinematography by
Raúl Martínez Solares 
 
Film Editing by
Jorge Bustos 
 
Production Design by
Javier Torres Torija 
 
Set Decoration by
Carlos Arjona  (as Carlos Arjona M.)
 
Makeup Department
María del Castillo .... makeup artist (as Ma. del Castillo)
 
Production Management
Fidel Pizarro .... production chief
Alfredo Salazar .... production manager
 
Second Unit Director or Assistant Director
Manuel Alcayde .... assistant director
Valerio Olivo .... sub-director
 
Sound Department
Eduardo Arjona .... dialogue recordist
James L. Fields .... sound supervisor
José Li-ho .... sound editor (as Jose Liho)
Galdino R. Samperio .... sound re-recordist (as Galdino Samperio)
 
Editorial Department
Joaquín Ceballos .... assistant editor
 

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