Eduardo Ciannelli
Doctor Satan
Robert Wilcox
Bob Wayne / Copperhead
William Newell
Speed Martin
C. Montague Shaw
Prof. Thomas Scott
Ella Neal
Lois Scott
Dorothy Herbert
Alice Brent
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
Ken Terrell
Corwin
Al Taylor
Joe
George Allen
Henchman-Driver Spike
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
Frank Conklin
Station Master Burns
Fred Criswell
Officer
Eddie Dew
Gas Station Attendant
Frank Ellis
Plant Henchman
Sam Garrett
Roper
Duke Green
Duke - Mine Thug
Alan Gregg
Red - Mine Thug
Kenneth Harlan
Capt. Lathrop
Charles Hutchison
Proprietor
Jerry Jerome
House Heavy
Patrick Kelly
Plant Henchman
Marten Lamont
Steve - Pilot
Bert LeBaron
Henchman Fallon
Jack O'Shea
House Heavy
Eddie Parker
Chuck - Lead Truck Thug
Hal Price
P&G Warehouse Mgr.
Ernest Sarracino
Henchman-Guard
Cy Schindell
Jake - Biplane Pilot
William Stahl
Detective Brock
Ted Stanhope
Warehouse Watchman
Tom Steele
Truck Henchman
Harry Strang
Police Officer Davis
Duke Taylor
Watkins - Fire Escape Thug
Robert Wayne
Detective Perry
Wally West
Palmer - Thug
Lloyd Whitlock
Prof. Williams
Bill Wilkus
Truck Henchman
Bud Wolfe
Sailor at Cable