Last updated 19 August 2023

Cast
Jon PertweeDoctor Who
Roger DelgadoMaster
Katy ManningJo Grant
Edwin RichfieldCaptain Hart
Clive MortonTrenchard
Royston TicknerRobbins
Neil SeilerRadio Operator
Declan MulhollandClark
Hugh FutcherHickman
June Murphy3rd Officer Jane Blythe
Alec WallisLdg. Telegraphist Bowman
Brian JusticeCastle Guard Wilson
Terry WalshCastle Guard Barclay
Pat GormanSea Devil
Stuart BarryChateau Guard
Bob BlaineChateau Guard
Mike HorsburghChateau Guard
Stuart FellStunt Man
Peter BraceStunt Man
Mike StephensStunt Man
Marc BoyleStunt Man
Eric MasonC.P.O. Smedley
Terry WalshStunt Man
Les ClarkeChateau Guard
Mike HorsburghStunt Man
Jim DowdallNaval Rating
Derek WareDouble for The Master
Donald SumpterCommander Ridgeway
David GriffinLt. Commander Mitchell
Christopher WrayLdg. Seaman Lovell
Stanley McGeaghCastle Guard Drew
Phillip WestonChateau Guard
Nick LlewellynSubmarine Rating
Roy PearceSubmarine Rating
Dennis PlentySubmarine Rating
Ron TingleySubmarine Rating
Colin BellC.P.O. Summers
Brian VaughanLt. Commander Watts
Jim DowdallChateau Guard
Brian GilmarChateau Guard
Steve IsmaySea Devil
Bryan NolanSea Devil
Geoffrey WitherickSea Devil
Rex RowlandA/B Girton
Martin BoddeyWalker
Norman AtkynsRear Admiral
Peter Forbes-RobertsonChief Sea Devil
Frank SetonSea Devil
John CaesarC.P.O. Myers
Derek WareStunt Man
Alan ChuntzStunt Man
Billy HorriganStunt Man
Jack CooperStunt Man
Production Team
Malcolm HulkeWriter
Michael E BriantDirector
Barry LettsProducer
Tony SnoadenDesigner
Terrance DicksScript Editor
Mike JefferiesStudio Lighting
Tony MillierStudio Sound
Maggie FletcherCostumes
Sylvia JamesMake-up
Peter DayVisual Effects Designer
Peter SargentFilm Cameraman
Martyn DayFilm Editor
Brian HodgsonSpecial Sound
Malcolm ClarkeIncidental Music
BBC Radiophonic WorkshopIncidental Music
Ron GrainerTitle Music
BBC Radiophonic WorkshopTitle Music
Royal NavyWith thanks to
Gordon PhillipsonGrams Operator
PW WalshFilm Operations Assistant
Alec ChristisonFilm Sound Assistant
John JeffordFilm Camera Assistant
Joanne BurnMake-Up Assistant
Peter ValentineTechnical Manager
John CollinsFilm Unit Electrician
Ian PunterFilm Camera Assistant
Grace DawsonCostume Assistant
Sybil CaveArtist Booking
John WatsonProperty Buyer
Sarah NewmanProduction Secretary
Tony CoxFloor Assistant
Jack RoeCostume Assistant
Phyllis PageArtist Booking
John GormanVision Mixer
Pauline SilcockDirector's Assistant
Tony ThorpeFilm Unit Electrician
Bill PagetGrip
Roger TwymanFilm Camera Assistant
Douglas NeedhamArmourer
Barry SimmonsCostume Assistant
HAVOCFight Arranger
Derek WareFight Arranger
Pauline SilcockAssistant
Joe BatesProperty Buyer
John BradburnAssistant Floor Manager
Colin DudleyProduction Assistant
Delia DerbyshireTitle Music Arranger
Bernard LodgeTitle Sequence
Jennie BettsLocation Assistant
S HedgesDriver
Edward KirkhamDriver
Pergo MinibusesLocation Transport
Bert WestPergo Driver
CinefoodLocation Catering
Seacliff Holiday CaravansLocation Trailers
Len HuttonVisual Effects Assistant
Pauline SilcockProduction Assistant
Colin DixonStudio Sound
Barry BonnerGrams Operator