- Lloyd Bridges
- Dr. Doug Standish
- Shirley Eaton
- Dr. Maggie Hanford
- Brian Kelly
- Dr. Craig Mosby
- David McCallum
- Dr. Phil Volker
- Keenan Wynn
- Hank Stahl
- Marshall Thompson
- Dr. Orin Hillyard
- Gary Merrill
- Dr. August Boren
- Ron Hayes
- Brinkman
- George Shibata
- Prof. Uji Hamaru
- Frank Logan
- Capt. of Diligence
- Don Wells
- Sonar Man
- Donald Linton
- Vice President
- Jack Ewalt
- Jack Smith
- George De Vries
- Lt. Coast Guard
- Tony Gulliver
- Officer
- Joey Carter
- Technician
- Celeste Yarnall
- Secretary
- Paul Gray
- Pilot