- Carla Balenda
- Janet Keller
- Elliott Reid
- Matt Corbin
- Edgar Barrier
- Dr. Edward Keller
- Raymond Burr
- Steve Loomis
- Otto Waldis
- Dr. Wilhelm Bucholtz
- Michael Steele
- Chick
- Lurene Tuttle
- Molly Loomis
- Peter Brocco
- Nate Garr
- Lewis Martin
- Peterson
- Frank Darien
- Luther Adams
- Olive Carey
- Mabel Turner
- George Barrows
- Federal Agent
- Stanley Blystone
- Guard on Pier
- Eddie Borden
- Medical Experiment Patient
- George Bruggeman
- Federal Agent
- William Challee
- Guard
- George Chandler
- Jed
- G. Pat Collins
- Nelson - Gate Guard
- Tom Daly
- Germ Experiment Victim
- Don Dillaway
- FBI Agent McIntyre
- Art Dupuis
- Speedboat Pilot
- Douglas Evans
- Carstairs
- Elizabeth Flournoy
- Secretary
- Robert Foulk
- Guard
- Gregory Gaye
- Sweitart
- Milton Kibbee
- Produce Company Proprietor
- Mathew McCue
- Medical Experiment Patient
- Lee Miller
- Federal Agent
- Billy Nelson
- Ed
- Jamesson Shade
- Sheriff
- Brick Sullivan
- Federal Agent
- Bob Thom
- Federal Agent
- Frank Wilcox
- Bradford
- William Yetter
- German Pier Guard
