Characters played by Kenneth Tobey
Cmdr. Pete Mathews
Characters played by Faith Domergue
Prof. Lesley Joyce
Characters played by Donald Curtis
Dr. John Carter
Characters played by Ian Keith
Adm. Burns
Characters played by Dean Maddox Jr.
Adm. Norman
Characters played by Chuck Griffiths
Lt. Griff
USN
Characters played by Harry Lauter
Deputy Bill Nash
Characters played by Richard W. Peterson
Capt. Stacy
Characters played by Tol Avery
Navy Intern
Characters played by William Bryant
Helicopter Pilot
Characters played by Del Courtney
Naval Asst. Sec. Robert David Chase
Characters played by Roy Engel
Control Room Officer Ordering Drop Nets
Characters played by Eddie Fisher
McLeod
Characters played by Sam Hayes
Radio Newscaster
Characters played by Jules Irving
King
Characters played by Jack Littlefield
Aston
Characters played by Rudy Puteska
Seaman Hall
Characters played by Charles H. Schneer
Extra
Characters played by Ray Storey
Reporter
Characters played by William Woodson
Opening Narrator