• 
  I. Stanford Jolley

  Dr. Blackton [Ch. 11]
• 
  Stanley Price

  Count Fator [Chs. 11-12]
• 
  Dale Van Sickel

  Henchman Harte [Chs. 6-7]
• 
  Robert J. Wilke

  Scott, armored car driver [Ch. 3]
• 
  Fred Graham

  Snyder [Chs. 1-2]/Zane [Ch. 8]
• 
  John Daheim

  Police driver [Ch. 3]/Relief Guard [Ch. 9]
• 
  Carey Loftin

  Lab guard #1 [Ch. 9]

• 
  Cy Feuer

  departament sunet

• 
  Paul Sawtell

  departament sunet
• 
  Adele Palmer

  costume and wardrobe departmen
• 
  Cy Feuer

  music department
• 
  John McCarthy Jr.

  set decorator
• 
  Howard Lydecker

  special effects
• 
  Dale Van Sickel

  cascador
• 
  Basil Dickey

  scriitor