Rock Hudson as Cdr. James Ferraday

Ernest Borgnine as Boris Vaslov

Patrick McGoohan as David Jones

Jim Brown as Capt. Leslie Anders

Tony Bill as Lt. Russell Walker

Alf Kjellin as Col. Ostrovsky

Gerald S. O'Loughlin as Lt. Cdr. Bob Raeburn

Ted Hartley as Lt. Jonathan Hansen

Murray Rose as Lt. George Mills

Michael T. Mikler as Lt. Courtney Cartwright

Joseph Bernard as Dr. Jack Benning

Jonathan Goldsmith as Russian Aide

Sherwood Price as Lt. Edgar Hackett

Lee Stanley as Lt. Mitgang

John Orchard as Survivor

Jim Dixon as Earl MacAuliffe

Ron Masak as Paul Zabrinczski

Boyd Berlind as Bruce Kentner

Craig Shreeve as Gafferty

Wade Graham as Parker

David Wendel as Cedric Patterson

Ronnie Rondell Jr. as Lyle Nichols

Ted Kristian as Wassmeyer

Lloyd Haynes as Webson

Michael Grossman as Kohler

Buddy Garion as Edward Rawlins

Don Newsome as Timothy Hirsch

Robert Carlson as Kelvaney

William O'Connell as Survivor

Michael Rougas as Fannovich

Gary Downey as Lorrison

T. J. Escott as Lt. Carl Mingus

Jed Allan as Peter Costigan

Buddy Joe Hooker as Hill

Lloyd Nolan as Admiral Garvey

Jim Goodwin as Survivor

William Byron Hillman as Philip Munsey

Dennis Alpert as Gambetta

Budd Albright as Seaman with torpedo accident (uncredited)

John Breen as Bar Patron (uncredited)

Louie Elias as Maneuver Sergeant (uncredited)

Ty Haller as Pvt. Grey (uncredited)

James Jeter as 2nd Barman (uncredited)

Larry Strong as Wardroom Attendent (uncredited)

Elliott Sullivan as Bartender (uncredited)