"An undercover agent wrongly punished for murder is paroled to a remote tropical island with a diamond mine slave labor run by a sadistic foreigner."
Peter Lorre
as Stephen Danel
Rochelle Hudson
as Lorraine Danel
Robert Wilcox
as Mark Sheldon
Don Beddoe
as Brand
George E. Stone
as Siggy
Kenneth MacDonald
as Doctor Rosener
Charles Middleton
as Captain Cort
Stanley Brown
as Eddie
Earl Gunn
as Mitchell
Sam Ash
as Ames - Parolee (uncredited)
Raymond Bailey
as Mystery Killer (uncredited)
Trevor Bardette
as District Attorney (uncredited)
Bruce Bennett
as Hazen - Guard (uncredited)
Bernie Breakston
as Townsend (uncredited)
Donald Douglas
as Department of Justice Official
Richard Fiske
as Hale (uncredited)
William Gould
as Parole Board Member (uncredited)
Chuck Hamilton
as Cop (uncredited)
Howard Hickman
as Judge (uncredited)
Al Hill
as Clinton (uncredited)
Eddie Laughton
as Borgo - Parolee (uncredited)
George McKay
as Clerk (uncredited)
Walter Miller
as Detective (uncredited)
Edmund Mortimer
Forbes Murray
as Chairman of Parole Board (uncredited)
Lee Prather
as Warden (uncredited)
Addison Richards
as Jackson (#46) (uncredited)
Harry Strang
John Tyrrell
as Durkin - Prisoner (uncredited)
Charles Barton
Director
Robert Kalloch
Costume Design
Gregory Stone
Music
Ben Oakland
Lodge Cunningham
Sound Recordist
Morris Stoloff
Music Director
Benjamin H. Kline
Director of Photography
James Sweeney
Editor
Robert Hardy Andrews
Screenplay
Gerard Carbonara
Original Music Composer
Lionel Banks
Art Direction