"Academic researchers are chased by a nuclear-hot specimen of ancient Mayan blob."
John Merivale
as Dr. John Fielding
Didi Sullivan
as Ellen Fielding
Gérard Herter
as Max Gunther
Daniela Rocca
as Linda
Vittorio André
as Prof. Rodriguez
Daniele Vargas
as Bob
Nerio Bernardi
as Police Inspector
Giacomo Rossi Stuart
as Prof. Rodriguez's Assistant
Gail Pearl
as Indian Dancer
Tom Felleghy
as Astronomo
Arturo Dominici
as Nieto
Mario Bava
as Mexican at police station (uncredited)
Renzo Palmer
as Narrator (voice)
Leslie Daniels
as Prof. John Fielding (voice)
Renato De Carmine
Stefano Sibaldi
as Max Gunther (voice)
Michele Malaspina
as Prof. Rodriguez (voice)
Rolf Tasna
as Bob (voice)
Sam Schneider
Producer
Special Effects
Salvatore Billitteri
Editor
Director of Photography
Filippo Sanjust
Writer
Riccardo Freda
Director
Roberto Nicolosi
Original Music Composer
Bruno Vailati
Co-Director
Mario Serandrei
Roman Vlad
Odoardo Fiory
Assistant Director
Carlo Rustichelli
Sound Effects
Massimo De Rita
Production Manager
Costume Design
Antonio Rinaldi
Gaffer
Maurice Rosenblum
Sound Recordist
Lionello Santi
Executive Producer
