- Ralph Byrd
- Lt. Terry Kent
- Bela Lugosi
- Boroff
- Maxine Doyle
- Jean Norman
- Richard Alexander
- Thorg
- Lee Ford
- Snapper McGee
- John Picorri
- G.A. Rackerby
- Lawrence Grant
- Rabinisi
- Thomas Carr
- Ensign Jim Kent
- Carleton Young
- Dodds
- Allen Connor
- Dick Norman
- George Chesebro
- L.H. Degardo
- Ranny Weeks
- Weis
- Roy Barcroft
- Cave Thug
- Earle D. Bunn
- Kelp Plant Thug
- Ed Cassidy
- Patrol Boat Captain
- Jack Daley
- Captain of the 'Carfax'
- Forrest Dillon
- Sea Wolf Thug
- Lester Dorr
- Radium Technician
- Robert Dudley
- Pierpont Station Agent
- Jerry Frank
- Smuggling Launch Thug
- Joseph W. Girard
- Admiral at Awards Ceremony
- Kit Guard
- Kelp Plant Thug
- Henry Hale
- Morovanian Scientist
- Jack Ingram
- Seaman
- Rex Lease
- Coast Guard Orderly
- Alexander Leftwich
- Morovanian Emissary
- Frankie Marvin
- Gang Sniper
- James Millican
- Dock Thug
- King Mojave
- Ambulance Driver-Thug
- Edwin Mordant
- Dr. Meade
- Michael Morgan
- Coast Guardsman Moore
- Henry Otho
- Mate on the 'Carfax'
- Herbert Rawlinson
- Cmdr. Boyle
- Loren Riebe
- Cave Thug
- Vinegar Roan
- Dock Thug
- Buddy Roosevelt
- Patrol Boat Lieutenant
- Reed Sheffield
- Cave Thug
- Harry Strang
- Phone Company Code Expert
- Duke Taylor
- Loader
- Tom Ung
- Chinese Cook on the 'Sea Wolf'
- Frank Wayne
- Cave Thug
- Dan Wolheim
- Slarsen, Captain of the 'Sea Wolf'
- Duke York
- Sea Wolf Thug
