Ronald Reagan

as Cmdr. Casey Abbott (Captain, USS Starfish)

Nancy Reagan

as Nurse Lt. Helen Blair

Arthur Franz

as Lt. Cmdr. Don Landon (XO, USS Starfish)

Robert Arthur

as Freddy Warren

William Leslie

as Lt. Paul Prentice

William Phillips

as Carroll (as William Phillips)

Harry Lauter

as Lt. (j.g.) Wes Barton

Michael Garth

as Bill aka Lt. Charlie

Joe Turkel

as Chick (as Joseph Turkel)

Don Keefer

as Jug

Chester W. Nimitz

as Himself (in prologue) (uncredited)