The U.S. submarine Anthony Wayne is underway for a top-secret mission. Onboard is a highly classified device that will give the Americans a decided nuclear advantage. The entire mission and the secret technology are threatened when the sub commander discovers his crew has been infiltrated by enemy agents. The commander is charged with trying to protect the device while ferreting out the enemy agents. Compounding matters is the state of the commander's physical and mental condition, which is being questioned by his crew.
Joseph Cotten
as Admiral
Lloyd Haynes
as Lt. Dave Burston
Dewey Martin
as Skip Langley
Leonard Nimoy
as Comdr. Phil Kettenring
William Windom
as Capt. Frank Reardon
Keenan Wynn
as Orville Kelly
Malachi Throne
as Dr. Dykers
Sam Elliott
as Ens. William 'Bill' Sandover
Ivor Barry
as Donald Ellington
Ron Masak
as CPO Corky Schmidt
Gordon Hoban
as Second Karp (False Karp)
Lee Stanley
as Lt. Manners
