Tom 'Duke' Martin
Barney
Paula Grant / Paula Jackson
Johnny Matlock
Webb
Pat
MacAllister
Michael Matlock
Diane Grant
First Kidnapper
Second Kidnapper
Mitchell
Professor Dohlmann
Miss Freda Dohlmann
Berlin Man
Man at Airport (uncredited)
Crystal Joy Club Patron (uncredited)
Lady at Airport (uncredited)
Waiter (uncredited)
Crystal Jug Club Patron (uncredited)
Man at Lost Luggage Counter (uncredited)
Undetermined Secondary Role (uncredited)
Little Boy (uncredited)
Laboratory Technician (uncredited)
Police Patrol Car Officer (uncredited)