 David TomlinsonTom Baker | Tom Baker |
 Peggy CumminsSusan Lashwood | Susan Lashwood |
 Brian ReeceLieutenant Commander Peter Fraser | Lieutenant Commander Peter Fraser |
 Eunice GaysonJane Godfrey | Jane Godfrey |
 A.E. MatthewsAdmiral Sir Maximillian Godfrey, K.C.B. | Admiral Sir Maximillian Godfrey, K.C.B. |
 Joan SimsMary | Mary |
 Lionel MurtonPsychiatrist | Psychiatrist |
 Reginald BeckwithReceptionist | Receptionist |
 Desmond Walter-EllisFlag Lieutenant Willy Oughton-Formby | Flag Lieutenant Willy Oughton-Formby |
 Ronald ShinerSalty Simpson | Salty Simpson |
 Peter CokeLieutenant Lashwood | Lieutenant Lashwood |
 Derek BlomfieldSub-Lieutenant Dobson | Sub-Lieutenant Dobson |
 Tom GillPetty Officer | Petty Officer |
 Howard WilliamsSub-Lieutenant | Sub-Lieutenant |
 Joan HicksonMother | Mother |
 Toke TownleySteward | Steward |
| AArthur LovegroveOrderly | Orderly |
 Ronald AdamFirst Sea Lord | First Sea Lord |
 Sam KyddAttendant | Attendant |
 Philip AshleyFirst Officer (uncredited) | First Officer (uncredited) |
 Alfie BassOrderly (uncredited) | Orderly (uncredited) |
| RRichard DukeCrewman (uncredited) | Crewman (uncredited) |
| RRoy EversonSeaman Jones (uncredited) | Seaman Jones (uncredited) |
 Harold GoodwinParker (uncredited) | Parker (uncredited) |
 Everley GreggHousekeeper (uncredited) | Housekeeper (uncredited) |
| DDavid HannafordAlfie (uncredited) | Alfie (uncredited) |
| VVictor HarringtonNaval Officer (uncredited) | Naval Officer (uncredited) |
 James HayterSir Henry Tomkinson (uncredited) | Sir Henry Tomkinson (uncredited) |
 Walter HorsbrughNight Receptionist (uncredited) | Night Receptionist (uncredited) |
| EEmrys LeyshonRadio Operator (uncredited) | Radio Operator (uncredited) |
