• 
  Ford Beebe

  regizor

• 
  Wyllis Cooper

  scenarist
• 
  Basil Dickey

  scenarist
• 
  Mildred Barish

  scenarist

• 
  Bela Lugosi

  Dr. Alex Zorka
• 
  Robert E. Kent

  Capt. Bob West
• 
  Dorothy Arnold (I)

  Jean Drew
• 
  Edwin Stanley

  Dr. Fred Mallory

• 
  Regis Toomey

  Lt. Jim Daley
• 
  Jack C. Smith

  Monk
• 
  Edward Van Sloan

  Jarvis
• 
  Dora Clement

  Ann Zorka
• 
  Anthony Averill

  Rankin
• 
  Hugh Huntley

  Perkins
• 
  Monte Vandergrift

  Gangster

• 
  Eddie Acuff

  Mac
• 
  Hooper Atchley

  Experimental lab tech [Ch. 8]
• 
  Lane Chandler

  Henchman with Rankin [Ch. 3]
• 
  Edmund Cobb

  Army sergeant [Ch. 12]
• 
  Frank Mayo

  AMI chief [Ch. 12]
• 
  Roy Barcroft

  Parker (AMI agent)
• 
  Eddie Dunn

  Poliţist
• 
  Harry Wilson

  Schooner crewman [Ch. 10]

• 
  Jerome Ash

  imagine
• 
  Irving Birnbaum

  montaj
• 
  Alvin Todd

  montaj
• 
  Charles Previn

  coloană sonoră
• 
  Saul A. Goodkind

  Regizor
• 
  Jim Farley

  Harbornaster