Lieutenant Braden discovers that Sally, the woman he's been falling in love with, has actually been checking out his qualifications to be a U.S. Navy frogman. He must put his personal life behind him after being assigned to be smuggled into a Japanese-held island via submarine to photograph radio codes.
| Actor | Role |
|---|---|
 James GarnerLt. J. G. Kenneth M. Braden | Lt. J. G. Kenneth M. Braden |
 Edmond O'BrienCommander Paul Stevenson | Commander Paul Stevenson |
 Andra MartinSally Johnson | Sally Johnson |
 Alan Hale Jr.Lt. Pat Malone | Lt. Pat Malone |
 Carleton CarpenterLt. Phil Carney | Lt. Phil Carney |
 Frank GiffordEnsign Cy Mount | Ensign Cy Mount |
 William LeslieLt. Doherty | Lt. Doherty |
 Richard BakalyanSeaman Peck | Seaman Peck |
 Edd ByrnesPharmacist Mate Ash | Pharmacist Mate Ash |
 Sean GarrisonSeaman Floyd | Seaman Floyd |
 Henry KulkyChief Petty Officer York | Chief Petty Officer York |
 Warren OatesSeaman Kovacs | Seaman Kovacs |
 Clifford KawadaJapanese (uncredited) | Japanese (uncredited) |
| FFrank WatkinsGruber (uncredited) | Gruber (uncredited) |
| PPeggy MoffittJukebox Girl | Jukebox Girl |
 Bernie HamiltonSeaman Weary | Seaman Weary |