Eduardo Ciannelli

Doctor Satan

Robert Wilcox

Bob Wayne / Copperhead

William Newell

Speed Martin

C. Montague Shaw

Prof. Thomas Scott

Ella Neal

Lois Scott

Charles Trowbridge

Gov. Bronson

Jack Mulhall

Police Chief Rand

Edwin Stanley

Col. Bevans

Walter McGrail

Stoner

Joe McGuinn

Gort

Bud Geary

Hallett

Paul Marion

Corbay

Archie Twitchell

Ross

Lynton Brent

Scarlett

Al Taylor

Joe

John Bagni

Gray, Pick-up Thug

Frank Brownlee

Panamint Pete

James Bush

Co-Pilot

Yakima Canutt

Sailor at Winch

Virginia Carroll

Nurse

Ed Cassidy

Barton

Davison Clark

Police Lieutenant

Tris Coffin

Wells - Governor's Secretary

Eddie Dew

Gas Station Attendant

Frank Ellis

Plant Henchman

Kenneth Harlan

Capt. Lathrop

Charles Hutchison

Proprietor

Marten Lamont

Steve - Pilot

Jack O'Shea

House Heavy

Eddie Parker

Chuck - Lead Truck Thug

Hal Price

P&G Warehouse Mgr.

Cy Schindell

Jake - Biplane Pilot

Ted Stanhope

Warehouse Watchman

Harry Strang

Police Officer Davis

Robert Wayne

Detective Perry

Wally West

Palmer - Thug

Lloyd Whitlock

Prof. Williams