The Black Widow

Bruce Edwards

as Steve Colt

Virginia Lee

as Joyce Winters (as Virginia Lindley)

Carol Forman

as Sombra, The Black Widow

Anthony Warde

as Nick Ward

Ramsay Ames

as Ruth Dayton

I. Stanford Jolley

as Dr. Z.V. Jaffa

Dave Anderson

as Porter-Spy

Theodore Gottlieb

as Hitomu

Virginia Carroll

as Dr. Ann Curry

Gene Roth

as John M. Walker

Sam Flint

as Prof. Henry Weston

LeRoy Mason

as Dr. Godfrey

Forrest Taylor

as Bradley

Ernie Adams

as Blinky

Keith Richards

as Michael Burns

George Chesebro

as J. Carter

Frank Lackteen

as A. Kabob

Carey Loftin

as Spike

Ted Mapes

as Slade

Jack O'Shea

as Finnegan

Gil Perkins

as Burke

John Phillips

as District Attorney Mark

Stanley Price

as Filmore Hagen

Larry Steers

as Dr. Harcourt

Ken Terrell

as Mendoza