A test pilot is missing and a search party is sent out in the jungles of Mexico; however, while searching they uncover a monster in the jungle who became this way due to a dose of radioactivity.
James Craig
Russ Bradford
Gloria Talbott
Susan Winter
Lon Chaney Jr.
Martin 'Marty' Melville
Tom Drake
Lee Brand
Duncan 'Dean' Parkin
The Cyclops
Vicente Padula
The Governor
Marlene Kloss
The Salesgirl
Manuel López
The Policeman
