- Philip Friend - Torps
- Chimmo Branson - Midshipman
- Ballard Berkeley - Engineer Commander
- Hubert Gregg - Pilot
- James Donald - Doc
- Michael Whittaker - Sub
- Kenneth Carten - Sub-Lieutenant R.N.V.R.
- John Varley - Secco
- Caven Watson - Brodie
- Geoffrey Hibbert - Joey Mackeridge
- Richard Attenborough - Young Stoker
- Frederick Piper - Edgecombe
- Lionel Grose - Reynolds
- Leslie Dwyer - Parkinson
- Charles Russell - Fisher
- John Singer - Moran
- Robert Moreton - Coombe
- John Boxer - Hollett
- Kenneth Evans - Posty
- Johnnie Schofield - Coxswain
- Franklyn Bennett - Commander Spencer
- Charles Compton - ? 1. "Tremoyne"
- Walter Fitzgerald - Colonel Lumsden
- Gerald Case - Jasper
- Daniel Massey - Bobby Kinross
- Ann Stephens - Lavinia Kinross
- Kathleen Harrison - Mrs. Blake
- Dora Gregory - Mrs. Lemmon
- Penelope Dudley-Ward - Maureen
- Barbara Waring - Mrs. Macadoo
- Eileen Peel - Mrs. Farrell
- Lesley Osmond - Nell Fosdick
- Josie Welford - Emily
- Kay Young - Barmaid
- Trixie Scales - Mona Duke
- George Carney - Mr. Blake
- Wally Patch - Uncle Fred
- Michael Anderson - Albert Fosdick
- Jill Stephens - May Blake
- Everley Gregg - Nurse
- Roddy Hughes - Photographer
- Norman Pierce - Mr. Satterthwaite
- Juliet Mills - Freda's Baby
- Leslie Howard - Narrator (voice) (uncredited)
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Andrew Nicholson, John Piper
Capítulo disponible en las siguientes plataformas:
