Eddie Carter
Dr. Craig Mitchell
John Ainsworth
Dr. Steven Russell
Daubeney Carshott
Capt. Jerry Brown / Jim Lofton
Doctor Marshall
Dr. Marshall, 'The Scorpion'
Curtis Powell
Agent Ted Kelly
Owen Rogers
Frank Gordon
Bruce Donaldson
Lieut. Dan Burke
Ted 'Rip-Roaring' Riley
Andrew Robinson
Capt. John Kent
Graham Smith
Henry Townsend
Attorney Johnson
Jimmy Milligan
Robert Thornton
Daniel Treve
Bill Ramsey
Bart Wallace
Prince Nicholas Petroff
Fred Garlan
Derek
George Edward Blaine
Jack
Marshall Jones
Johnny
Dr. Bradford
Nikolai Roget
Bobby Bailey
Philip Lennox
Jerry Booth
Franz Pless
John Barton
Felipe
Gil Barry
Theodore Wayne
Richard Castleman / Danny Rowland
Waite Lifter
Julian Perryam
Donald Marshall
Philip Collett
Rance Conway
Ned Thayer
Blair Farquar
Edward E. Malone
The Hero
Lionel Tressilian
Dick Forrest
Jack Hare
John Trevor
Sam Gladding
Cody Jacques
Frederick Graves
David Beresford
John Trott
Dick Revel
Luther Flint
Roger Moran
John King
Jules Patricia
Reporter (uncredited)
