- Robert Crichtonnovel: "The Great Impostor", 1959
- Liam O'Brienscreenplay
- Dick Sargent(as Richard Sargent)
- Robert Crawford Jr.(as Robert Crawford)
Rest of cast listed alphabetically
- Robert Anderson(uncredited)
- Robert Barrow(uncredited)
- Nicky Blair(uncredited)
- Helen Boll(uncredited)
- John Breen(uncredited)
- Maggie Brooks(uncredited)
- George Bruggeman(uncredited)
- George Calliga(uncredited)
- Charles Cane(uncredited)
- Charles Cantor(uncredited)
- Jane Chang(uncredited)
- Gage Clarke(uncredited)
- John Cliff(uncredited)
- Russ Conway(uncredited)
- Wilson Cornell(uncredited)
- Jack Deery(uncredited)
- Lincoln Demyan(uncredited)
- Joanna Dix(uncredited)
- James Dobson(uncredited)
- Robert Dornan(uncredited)
- James Drake(uncredited)
- Scott Elliott(uncredited)
- Michael Emmet(uncredited)
- Michael Ford(uncredited)
- Richard Gaines(uncredited)
- Richard George(uncredited)
- Tim Graham(uncredited)
- Joe Gray(uncredited)
- Harry Harvey Jr.(uncredited)
- Bob Herron(uncredited)
- Shep Houghton(uncredited)
- William Hudson(uncredited)
- Dale Ishimoto(uncredited)
- Bob January(uncredited)
- Kenner G. Kemp(uncredited)
- Robert Kino(uncredited)
- Ted Knight(uncredited)
- George Lake(uncredited)
- Hugh Lawrence(uncredited)
- Karl Lukas(uncredited)
- Herbert Lytton(uncredited)
- Ted Markland(uncredited)
- Douglas Marland(uncredited)
- Alphonse Martell(uncredited)
- Frank Maxwell(uncredited)
- Tipp McClure(uncredited)
- John McComb(uncredited)
- Oliver McGowan(uncredited)
- Bill McLean(uncredited)
- David McMahon(uncredited)
- John W. Morley(uncredited)
- Colleen O'Sullivan(uncredited)
- Charles Perry(uncredited)
- Anthony Redondo(uncredited)
- Tony Regan(uncredited)
- Nancy Root(uncredited)
- Bing Russell(uncredited)
- Frank Sentry(uncredited)
- Dan Sheridan(uncredited)
- Paul Sorensen(uncredited)
- Tom Steele(uncredited)
- Norman Stevans(uncredited)
- Roy Taguchi(uncredited)
- George Taylor(uncredited)
- Harry Townes(uncredited)
- Warren Vanders(uncredited)
- Jarl Victor(uncredited)
- Don Wilbanks(uncredited)
- Barbara Wooddell(uncredited)
- John Zaremba(uncredited)
- Robert Arthurproducer
- Robert Burksdirector of photography
- Larry Germainhair stylist
- Bud Westmoremakeup artist
- E. Thomas Casemakeup artist (uncredited)
- Lynn F. Reynoldsmakeup artist (uncredited)
- Edward Doddsunit production manager (uncredited)
- Joseph E. Kenneyassistant director (as Joseph Kenny)
- Charles R. Scott Jr.assistant director (uncredited)
- Robert Luthardtassistant art director (uncredited)
- Julius Rosenkrantzprops (uncredited)
- Frank H. Wilkinsonsound (as Frank Wilkinson)
- Don Bolgersound technician (uncredited)
- Jack Danskinsound technician (uncredited)
- James V. Swartzsound technician (uncredited)
- Tom Steelestunts (uncredited)
- Gene Liggettassistant camera (uncredited)
- Lennie Southcamera operator (uncredited)
- Leonard J. Southcamera operator (uncredited)
- Norman Mayreiswardrobe (uncredited)
- Marie Osbornewardrobe (uncredited)
- Peter V. Salduttiwardrobe (uncredited)
- Joseph Gershensonmusic supervisor
- Ethmer Rotenmusician: flute (uncredited)
- Paul Salamunovichchoral conductor (uncredited)
- Bob Forrestscript supervisor (uncredited)
- James Plomertechnical advisor (as Commodore James Plomer RCN)
Crew believed to be complete
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