• 
  Alan James

  regizor

• 
  Franklin Adreon

  scenarist
• 
  Barry Shipman

  scenarist

• 
  Ralph Byrd

  Lt. Terry Kent
• 
  Bela Lugosi

  Boroff
• 
  Maxine Doyle

  Jean Norman
• 
  Richard Alexander

  Thorg
• 
  Lee Ford

  Snapper McGee

• 
  Herbert Rawlinson

  Cmdr. Boyle
• 
  John Picorri

  G.A. Rackerby
• 
  Lawrence Grant

  Rabinisi
• 
  Thomas Carr

  Ens. Jim Kent
• 
  Allen Connor

  Dick Norman
• 
  George Chesebro

  L.H. DeGado
• 
  Ranny Weeks

  Wies

• 
  Frank Fanning

  Roadside Police Sergeant [Ch. 3]
• 
  Robert J. Wilke

  Seaman
• 
  Carleton Young

  Henchman Dodds [Ch. 4]
• 
  James Millican

  Dock Heavy 4 [Chs. 6-7, 10]
• 
  Kit Guard

  Kelp Plant Heavy 2 [Chs. 8-9]
• 
  Curley Dresden

  Dock Heavy 1 [Chs. 6-7, 10]
• 
  Roy Barcroft

  Goebel, Henchman [Chs. 2, 10]
• 
  Harry Strang

  Phone Company Code Expert [Ch. 2]
• 
  Baldwin Cooke

  Seaman

• 
  William Nobles

  imagine
• 
  Murray Seldeen

  montaj
• 
  Edward Todd

  montaj
• 
  Alberto Colombo

  coloană sonoră
• 
  William Witney

  Regizor
• 
  Morgan Cox

  o poveste de