Lloyd Hughes

---

Eddie Carter

Daubeney Carshott

Dr. Steven Russell

John Ainsworth

Dr. Craig Mitchell

Dr. Marshall, 'The Scorpion'

Doctor Marshall

Capt. Jerry Brown / Jim Lofton

Bruce Donaldson

Frank Gordon

Owen Rogers

Agent Ted Kelly

Curtis Powell

Attorney Johnson

Henry Townsend

Graham Smith

Fred Truslow

Capt. John Kent

Andrew Robinson

Ted 'Rip-Roaring' Riley

Lieut. Dan Burke

Robert Thornton

Jimmy Milligan

Prince Nicholas Petroff

Dr. Robert Sanford

Bob Rogers

Bart Wallace

Tony Hill

Bill Ramsey

Daniel Treve

Johnny Stark

Marshall Jones

Jack

George Edward Blaine

Bill

Derek

Fred Garlan

Bobby Bailey

Nikolai Roget

Dr. Bradford

Don Manning

Cal

Philip Lennox

Jerry

John Barton

Franz Pless

Jerry Booth

Hayden Eaton

Donald Marshall

Julian Perryam

Waite Lifter

Richard Castleman / Danny Rowland

Theodore Wayne

Gil Barry

Felipe

Edward E. Malone

Charlie Jordan

Blair Farquar

Ned Thayer

Rance Conway

Phil Douglas

Philip Collett

John Trevor

Jack Hare

Dick Forrest

Robert Ardis

Lionel Tressilian

Ned Tyler

Julian Greer

The Hero

Cody Jacques

Oliver Wendell Blaine

Harvey Livermore

Sam Gladding

(Unknown)

Frederick Graves

Dick Revel

Robert Sheldon

John Trott

David Beresford

Roger Moran

Luther Flint

Himself

Tad Worden

Paul Perry

Dick Ross

Dick Armitage

Roland

John King

Reporter (uncredited)

Ted Marshall

Jules Patricia