Director
Howard Bretherton
DIRECTOR
Stars (in credits order)
Robert Lowery
Ken Morgan
George Macready
Prof. Ernst
Ralph Morgan
Professor Franklin Arnold
Carole Mathews
Babs Arnold
Willie Best
Flash
Jack Ingram
Dick Nordik
Anthony Warde
Joe Flint
Ted Mapes
Joe Butle
Eddie Parker
Blake
Stanley Price
Mead
Charles King
First Cop with Thor [Ch. 10,11,13]
Kenneth MacDonald
Police Inspector Hamilton [Ch. 8,12]
Bud Osborne
Mason - Zoo Night Watchman [Ch. 3,8,10]
Steve Benton
Police Officer(uncredited)
Ray Corrigan
Thor the Gorilla(uncredited)
Oliver Cross
Reporter(uncredited)
Dulce Day
George Eldredge
Professor Ames(uncredited)
John Elliott
Professor Marsden(uncredited)
Dick Gordon
Herschel Graham
Kit Guard
Zoo Guard(uncredited)
Henry Hall
Dr. John Draper(uncredited)
Eddie Kane
Dr. Draper's Assistant(uncredited)
Forbes Murray
Professor Jonathan Shaw(uncredited)
Dick Rush
McGarry - Armored Truck Guard(uncredited)
Lee Shumway
Tunnel Foreman Hartley(uncredited)