Paul
Antonio Cantafora
Kronos/Supersonic Man
José Luis Ayestarán
Ángel Ter
Emilio Higuera
Luis Castilla
Emilio Fornet
Marta Fernández Muro
José Antonio Rico
(voice)
Teófilo Martínez
Óscar Simón
Dr. Gulik
Cameron Mitchell
Patricia Morgan / Patricia Gordon
Diana Polakov
Prof. Morgan / Prof. Gordon
José María Caffarel
Peterson
Frank Braña
Drunk
Javier De Campos
George
Tito García
Harrison
Luis Barboo
Bill
Quique Camoiras
Editor
Pedro del Rey
Director
Juan Piquer Simón
Screenplay
Executive Producer
Special Effects
Director of Photography
Juan Mariné
Sebastian Moi
Producer
Faruk Alatan
Dick Randall
Music
Carlos Attias
Juan Luis Izaguirre
Gino Peguri
Art Direction
Emilio Ruiz del Río
Francisco Prósper