Steve Colt
Bruce Edwards
Joyce Winters (as Virginia Lindley)
Virginia Lee
Prof. Henry Weston
Sam Flint
Dr. Godfrey
LeRoy Mason
Bradley
Forrest Taylor
Blinky
Ernie Adams
Michael Burns
Keith Richards
J. Carter
George Chesebro
A. Kabob
Frank Lackteen
Spike
Carey Loftin
Slade
Ted Mapes
Finnegan
Jack O'Shea
Sombra, The Black Widow
Carol Forman
Burke
Gil Perkins
District Attorney Mark
John Phillips
Filmore Hagen
Stanley Price
Dr. Harcourt
Larry Steers
Mendoza
Ken Terrell
Nick Ward
Anthony Warde
Ruth Dayton
Ramsay Ames
Dr. Z.V. Jaffa
I. Stanford Jolley
Porter-Spy
Dave Anderson
Hitomu
Theodore Gottlieb
Dr. Ann Curry
Virginia Carroll
John M. Walker
Gene Roth
Director
Spencer Gordon Bennet
Fred C. Brannon
Editor
Sam Starr
Cliff Bell Sr.
Associate Producer
M.J. Frankovich
Director of Photography
John MacBurnie
Set Decoration
John McCarthy Jr.
Art Direction
Fred A. Ritter
James Redd
Producer
Anthony Hinds