Lloyd Hughes

as Edward E. Malone

as Waite Lifter

as Nikolai Roget

as Eddie Carter

as Dr. Craig Mitchell

as John Ainsworth

as Dr. Steven Russell

as Daubeney Carshott

as Capt. Jerry Brown / Jim Lofton

as Dr. Marshall, 'The Scorpion'

as Doctor Marshall

as Curtis Powell

as Agent Ted Kelly

as Owen Rogers

as Frank Gordon

as Bruce Donaldson

as Lieut. Dan Burke

as Ted 'Rip-Roaring' Riley

as Andrew Robinson

as Capt. John Kent

as Fred Truslow

as Graham Smith

as Henry Townsend

as Attorney Johnson

as Jimmy Milligan

as Robert Thornton

as Daniel Treve

as Bill Ramsey

as Tony Hill

as Bart Wallace

as Bob Rogers

as Dr. Robert Sanford

as Prince Nicholas Petroff