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