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