- Charles Quigley
- Duncan Richards
- Linda Stirling
- Diana Farnsworth
- Clayton Moore
- Louis Ashe
- I. Stanford Jolley
- Blackton
- Kenne Duncan
- Chambers
- Forrest Taylor
- Prof. Van Wyck
- Emmett Vogan
- Prof. Anderson
- Sam Flint
- Prof. Maxwell
- Joseph Forte
- Parker
- Stanley Price
- Count Fator
- Wheaton Chambers
- Wilson
- Tom Steele
- Stricker
- Dale Van Sickel
- Harte
- Rex Lease
- Bain
- Fred Graham
- Zane
- Bud Wolfe
- Cross
- Rod Bacon
- Armored Car Guard
- Virginia Carroll
- Nurse
- John Daheim
- Relief Guard
- Carey Loftin
- Lab Guard 1
- George Magrill
- Fiske
- Eddie Parker
- Sherman
- Rose Plumer
- Mrs. Malloy
- Loren Riebe
- Truck Henchman
- Eddie Rocco
- Kell
- Dick Rush
- Police Inspector
- Duke Taylor
- Henchman
- Ken Terrell
- Warehouse Guard
- Robert J. Wilke
- Scott
- Bill Wilkus
- Cole
- Bill Yrigoyen
- Lab Henchman
- Joe Yrigoyen
- Phoney Conference Room Janitor
