- David Savile
- Â Lt. Cmdr. Beaumont / ... 32 episodes, 1973-1976
- Andrew Burt
- Â Lt. Peek 26 episodes, 1976-1977
- James Cosmo
- Â L / ... 21 episodes, 1973-1977
- Donald Burton
- Â Cmdr. Mark Nialls / ... 20 episodes, 1973-1976
- John Lee
- Â Lt. Cmdr. Kiley / ... 20 episodes, 1973-1977
- Don Henderson
- Â MAA Heron / ... 18 episodes, 1973-1976
- Norman Eshley
- Â Lt. Last / ... 17 episodes, 1973-1974
- Graeme Eton
- Â Lt. Wakelin / ... 14 episodes, 1973-1977
- Bryan Marshall
- Â Cmdr. Alan Glenn 13 episodes, 1976
- Derek Godfrey
- Â Capt. Edward Holt 13 episodes, 1977
- Robert Morris
- Â Lt. Cmdr. Napier 13 episodes, 1977
- Frank Jarvis
- Â MAA Burnett / ... 8 episodes, 1973-1977
- Prunella Ransome
- Â Zoe Carter 8 episodes, 1977
- Colin Rix
- Â LMA Milner 5 episodes, 1974-1977
- Nigel Humphreys
- Â L / ... 5 episodes, 1977
- Christopher Coll
- Â Lieutenant Boswall 4 episodes, 1973
- Steve Gardner
- Â AB Grogan / ... 4 episodes, 1973-1976
- Roger Tallon
- Â L / ... 4 episodes, 1973-1976
- Richard Warwick
- Â Lieutenant Parry 3 episodes, 1973
- Rex Robinson
- Â Lieutenant Commander Junnion 3 episodes, 1973
- Donald Hewlett
- Â Rear Admiral Mulliner / ... 3 episodes, 1973-1976
- John Bowe
- Â L / ... 3 episodes, 1974
- James Leith
- Â Lt. Tagg 3 episodes, 1976
- Marian Diamond
- Â Sue 3 episodes, 1976
- Frederick Jaeger
- Â Anvey / ... 2 episodes, 1973-1976
- Rio Fanning
- Â CPO Cranfield / ... 2 episodes, 1973-1976
- Peter Miles
- Â Corbin / ... 2 episodes, 1973-1977
- John Savident
- Â Admiral Norris / ... 2 episodes, 1973-1974
- Peter Winter
- Â Lt. Meville / ... 2 episodes, 1973-1974
- Nicholas McArdle
- Â Baker / ... 2 episodes, 1973-1976
- Peter Cellier
- Â Capt. Calder / ... 2 episodes, 1974-1977
- John Ringham
- Â Cmdr. Hirsch / ... 2 episodes, 1974-1977
- Jon Croft
- Â CPO Firth / ... 2 episodes, 1974-1977
- Ian Liston
- Â Harry Shotton / ... 2 episodes, 1974-1977
- Philip Bond
- Â Cmdr. Hilliard / ... 2 episodes, 1974-1976
- Arnold Peters
- Â President of the Court 2 episodes, 1974-1976
- David Sterne
- Â Sgt. Watkins 2 episodes, 1974
- Michael Cochrane
- Â Lt. Palfrey RM 2 episodes, 1974
- Frederick Treves
- Â Major 2 episodes, 1974
- Geoffrey Toone
- Â General Tiering 2 episodes, 1974
- Kenneth Scott
- Â Cpl. Blundell 2 episodes, 1974
- Michael Culver
- Â Cmdr. Cleveland / ... 2 episodes, 1976-1977
- Paul Aston
- Â Mid Vidler 2 episodes, 1976-1977
- Tony Steedman
- Â Flynn 1 episode, 1973
- Malcolm Terris
- Â Commander Murton 1 episode, 1973
- Tony Selby
- Â PO-Wtr. Willows 1 episode, 1973
- Dennis Blanch
- Â AB Tom Drew 1 episode, 1973
- Kara Wilson
- Â Angela 1 episode, 1973
- Heather Canning
- Â Maura 1 episode, 1973
- Denis Lill
- Â Lieutenant Commander Aubrey 1 episode, 1973
- Richard Marner
- Â Trepanov 1 episode, 1973
- Karl Howman
- Â AB Mick Turner 1 episode, 1973
- Anthony Ainley
- Â Phillip Tashing 1 episode, 1973
- Billy Hamon
- Â Wtr. Parkins 1 episode, 1973
- Charles Bolton
- Â Bunny 1 episode, 1973
- Alec Mango
- Â Savona 1 episode, 1973
- Patricia Mort
- Â Peggy Carter 1 episode, 1973
- Bruce Boa
- Â McFie 1 episode, 1973
- Paul Chapman
- Â Lieutenant Grieve 1 episode, 1973
- Angus MacKay
- Â Colin Bennett 1 episode, 1973
- Brian Peck
- Â Tolliday 1 episode, 1973
- Nicolette McKenzie
- Â Vera Cesnik 1 episode, 1973
- William Maxwell
- Â AB 'Porky' Walker 1 episode, 1973
- Sheila Beckett
- Â Mrs. Willows 1 episode, 1973
- Gaye Brown
- Â Janet McFie 1 episode, 1973
- Peter Birrel
- Â Spiro 1 episode, 1973
- David Neal
- Â Lieutenant Commander Hopwood 1 episode, 1973
- Anton Phillips
- Â AB Wallace 1 episode, 1973
- Patricia Prior
- Â Diana Bennett 1 episode, 1973
- Victor Winding
- Â Slater 1 episode, 1973
- Paul Haley
- Â LMA 'Doc' Peters 1 episode, 1973
- Leonard Kingston
- Â Erwin 1 episode, 1973
- James Garbutt
- Â Munro 1 episode, 1973
- Andrew McCulloch
- Â Cutler 1 episode, 1973
- Arnold Diamond
- Â Minister Aziz 1 episode, 1973
- Forbes Collins
- Â Master at Arms Wilson 1 episode, 1973
- Barrie Cookson
- Â C 1 episode, 1973
- Mary Webster
- Â Gina 1 episode, 1973
- Graham Simpson
- Â AB Pomeroy 1 episode, 1973
- Shaun Curry
- Â Lieutenant Commander Padden 1 episode, 1973
- Ron Pember
- Â AB Adge 1 episode, 1973
- Colin McCormack
- Â Petty Officer James 1 episode, 1973
- Hugh Latimer
- Â Rear Admiral Cardine 1 episode, 1973
- Ronald Chenery
- Â Captain Ferhat 1 episode, 1973
- Richard Hampton
- Â Flag Lieutenant 1 episode, 1973
- Brian Jameson
- Â Leading Steward Brown 1 episode, 1973
- MacDonald Hobley
- Â Chief of the Defence Staff 1 episode, 1973
- Richard Aylen
- Â Large 1 episode, 1973
- Robert Aldous
- Â Chief Petty Officer, HMS Omega 1 episode, 1973
- Bob Babenia
- Â Hamouda - Carpet Seller 1 episode, 1973
- Stephen Stacey
- Â Loftus 1 episode, 1973
- David Troughton
- Â Doc Pitman 1 episode, 1973
- Jon Laurimore
- Â Superintendent Bellamy 1 episode, 1973
- Terry Bale
- Â CPO Watson 1 episode, 1973
- Terence Sewards
- Â The Major 1 episode, 1973
- Alec Wallis
- Â Chief Petty Officer Bates 1 episode, 1973
- Russell Denton
- Â AB Selby 1 episode, 1973
- Yakar Semach
- Â Gunboat Captain 1 episode, 1973
- Mike Lewin
- Â Sergeant Woods 1 episode, 1973
- David Purcell
- Â Chief - Second CPO 1 episode, 1973
- David Griffith
- Â Blackie 1 episode, 1973
- Ian Judge
- Â Pettigrew 1 episode, 1973
- Peter Longbow
- Â Fleet Operations Officer 1 episode, 1973
- Leslie Tucker
- Â Newsreader 1 episode, 1973
- Yashar Adem
- Â Arab Officer 1 episode, 1973
- Robert Mill
- Â Knox Palmer 1 episode, 1973
- Oliver Gilbert
- Â Comms Rating, HMS Hero 1 episode, 1973
- Gino Melvazzi
- Â Tony 1 episode, 1973
- Jonathan Gardner
- Â Leading Writer 1 episode, 1973
- Carlos Douglas
- Â Barman 1 episode, 1973
- Mark Elwes
- Â Naval Liaison Officer 1 episode, 1973
- Maurice Quick
- Â Flag Officer, Gibralter 1 episode, 1973
- Peter Messaline
- Â ERA, HMS Omega 1 episode, 1973
- Laurie Webb
- Â Customs Officer 1 episode, 1973
- Kenneth Kennedy
- Â Helmsman, HMS Omega 1 episode, 1973
- Roy Evans
- Â Cook Meadows 1 episode, 1973
- Leo Dolan
- Â Docker 1 episode, 1973
- David Hayward
- Â Afterplanesman, HMS Omega 1 episode, 1973
- Leslie Southwick
- Â Archibald 1 episode, 1973
- Nadim Sawalha
- Â Arab Pilot 1 episode, 1973
- Ahmed Osman
- Â Arab Operator One 1 episode, 1973
- Albert Moses
- Â Arab Operator Two 1 episode, 1973
- Joanna Royce
- Â Russian Secretary 1 episode, 1973
- Hovhannes I. Pilikian
- Â Arab Officer 1 episode, 1973
- Pat Gorman
- Â Ops Room Operator 1 episode, 1973
- Isla Blair
- Â Sarah Foules 1 episode, 1974
- Mary Tamm
- Â Zimba 1 episode, 1974
- Struan Rodger
- Â Sub-Lt. Penn 1 episode, 1974
- Lewis Collins
- Â L / ... 1 episode, 1974
- Ed Bishop
- Â Sanders 1 episode, 1974
- Julian Holloway
- Â O'Morra 1 episode, 1974
- Jenny Hanley
- Â Helen Danbury 1 episode, 1974
- Tom Chadbon
- Â Ron Walker 1 episode, 1974
- Helen Lindsay
- Â Angela Palfrey 1 episode, 1974
- Bernard Kay
- Â Skipper Briggs 1 episode, 1974
- Aharon Ipalé
- Â Maritain 1 episode, 1974
- Kevin Stoney
- Â Capt. Ragg 1 episode, 1974
- Seretta Wilson
- Â Karen Halbert 1 episode, 1974
- Mary Hignett
- Â Mrs. Beaumont 1 episode, 1974
- Paul Williamson
- Â Judge Advocate 1 episode, 1974
- Peter Cartwright
- Â Sg. Lt. Cmdr. Whittaker 1 episode, 1974
- Christopher Blake
- Â Sg. Lt. Newcombe 1 episode, 1974
- Patrick Holt
- Â Paul Danbury 1 episode, 1974
- Robin Davies
- Â Ord. Jones 1 episode, 1974
- John Quarmby
- Â Defence Secretary 1 episode, 1974
- Thomas Heathcote
- Â Norman King 1 episode, 1974
- Neil Wilson
- Â Barman 1 episode, 1974
- Noel Johnson
- Â R-Admiral Beaumont 1 episode, 1974
- Sean Lynch
- Â Zardi 1 episode, 1974
- Peter Davidson
- Â Constable Munk 1 episode, 1974
- Gail Grainger
- Â Heather Gardiner 1 episode, 1974
- John Hartley
- Â Stan Beaton 1 episode, 1974
- Ellis Jones
- Â AB Richards 1 episode, 1974
- Richard Warner
- Â Lescher 1 episode, 1974
- Anthony Langdon
- Â Minister of State 1 episode, 1974
- Keith Smith
- Â DNOT 1 episode, 1974
- Anne Raitt
- Â Luna 1 episode, 1974
- Simon Lack
- Â Grey 1 episode, 1974
- Eric Kent
- Â Bosun's Mate 1 episode, 1974
- Geoffrey Russell
- Â Williams 1 episode, 1974
- James Walsh
- Â Joe Carter 1 episode, 1974
- Frank Duncan
- Â Mr. Cook 1 episode, 1974
- John Oxley
- Â Wickert / ... 1 episode, 1974
- Joe Dunlop
- Â L / ... 1 episode, 1974
- David March
- Â Muller 1 episode, 1974
- Antony Webb
- Â AB Radcliffe 1 episode, 1974
- Stephen Hubay
- Â Rames 1 episode, 1974
- Anthony Barnett
- Â Std. Selkirk 1 episode, 1974
- David Goodland
- Â Officer of the Court 1 episode, 1974
- John Colclough
- Â Quartermaster 1 episode, 1974
- Kenneth Shaw
- Â The Norwegian A.D.C. 1 episode, 1974
- David Ashley
- Â Ahmed 1 episode, 1974
- Allan Travell
- Â Quartermaster 1 episode, 1974
- John Rhys-Davies
- Â CPO Cook Mantell 1 episode, 1976
- David Prowse
- Â The Ape 1 episode, 1976
- Bernard Lee
- Â Yachtsman 1 episode, 1976
- John Duttine
- Â AB Scobie 1 episode, 1976
- David Robb
- Â Lt. Dean 1 episode, 1976
- John Castle
- Â Lt. Cmdr. Tremayne 1 episode, 1976
- Hugh Ross
- Â Sg. Lt. Gladman 1 episode, 1976
- Suzan Farmer
- Â Julia Brinton 1 episode, 1976
- Leslie Schofield
- Â PO Mills 1 episode, 1976
- Michael Sheard
- Â R-Admiral Chandy 1 episode, 1976
- Mark Eden
- Â Wing Cmdr. Blazey 1 episode, 1976
- Harry Landis
- Â Barman 1 episode, 1976
- Christopher Strauli
- Â Lt. Cavan 1 episode, 1976
- William Lucas
- Â Capt. Herrick 1 episode, 1976
- Robert East
- Â Lt. Cmdr. Huffam 1 episode, 1976
- Christopher Ravenscroft
- Â Sg. Lt. Ansell 1 episode, 1976
- Richard Leech
- Â R-Admiral Brinton 1 episode, 1976
- Claire Nielson
- Â Velrie Kenyon 1 episode, 1976
- Arthur White
- Â Sam Malcolm 1 episode, 1976
- Lea Brodie
- Â Anna Cavan 1 episode, 1976
- Michael Halsey
- Â Belton 1 episode, 1976
- George Sweeney
- Â AB Smith 1 episode, 1976
- Bill Treacher
- Â Pat 1 episode, 1976
- Oliver Smith
- Â L / ... 1 episode, 1976
- Caroline Mortimer
- Â Katharina 1 episode, 1976
- Shirley Cain
- Â Edith 1 episode, 1976
- Bob Mason
- Â Graham Firth 1 episode, 1976
- Peter Duncan
- Â Seaman Dorrity 1 episode, 1976
- Michael Stainton
- Â Kendall 1 episode, 1976
- Nigel Plaskitt
- Â Steward 1 episode, 1976
- Sidney Kean
- Â Lewis 1 episode, 1976
- Catherine Neilson
- Â Rita Kersey 1 episode, 1976
- Hugh Dickson
- Â Barron 1 episode, 1976
- Roy Boyd
- Â Joe Murphy 1 episode, 1976
- Eric Mason
- Â CPO Lusher 1 episode, 1976
- Neville Jason
- Â Cmdr. Rockford 1 episode, 1976
- Elizabeth Cassidy
- Â Bobbie 1 episode, 1976
- Keith Bell
- Â Petrie 1 episode, 1976
- Martyn Read
- Â Cmdr. Creegan 1 episode, 1976
- Kevin Brennan
- Â Edwards 1 episode, 1976
- Richard Adams
- Â Plotter 1 episode, 1976
- Matthew Long
- Â David Kenyon 1 episode, 1976
- Richard Simpson
- Â Judge Advocate 1 episode, 1976
- Joan Turner
- Â Lily Bevis 1 episode, 1976
- John Line
- Â Capt. Redwell 1 episode, 1976
- Alan Hockey
- Â Councillor Acott 1 episode, 1976
- John Barcroft
- Â Henderson 1 episode, 1976
- Beryl Nesbitt
- Â Receptionist 1 episode, 1976
- Andy Mulligan
- Â MEAP Ellis 1 episode, 1976
- Richard Grant
- Â Clarke 1 episode, 1976
- Warwick Evans
- Â Sub-Lt. Weyland 1 episode, 1976
- Edward Brooks
- Â Chief Experimenter 1 episode, 1976
- Duncan Faber
- Â AB Kackson 1 episode, 1976
- Keith Varnier
- Â Eddie 1 episode, 1976
- David Kincaid
- Â Haslam 1 episode, 1976
- Harry Waters
- Â TASI 1 episode, 1976
- Paul Alexander
- Â Lt. Ringshaw 1 episode, 1976
- Ian Kellgren
- Â Lt. Kennedy 1 episode, 1976
- Victoria Shellard
- Â Diana 1 episode, 1976
- Howard Southern
- Â Det. Sgt. Maynard 1 episode, 1976
- Bernard Martin
- Â Policeman 1 episode, 1976
- Nigel Crewe
- Â Officer of the Court 1 episode, 1976
- Stanley Platts
- Â Judge 1 episode, 1976
- Brian Honeyball
- Â Cook 1 episode, 1976
- Jean McArthur
- Â Norma 1 episode, 1976
- Christopher Cregan
- Â AB Edwards 1 episode, 1976
- Bernard Hill
- Â CPO Straker 1 episode, 1977
- Sarah Douglas
- Â Amanda 1 episode, 1977
- Ian McNeice
- Â AB Clark 1 episode, 1977
- David Rintoul
- Â Lt. Cmdr. Ledson 1 episode, 1977
- David Bailie
- Â Panmuir 1 episode, 1977
- Patrick Troughton
- Â Robertson 1 episode, 1977
- Burt Kwouk
- Â Zee Khay Lim 1 episode, 1977
- Rosalind Ayres
- Â Barbara Perrin 1 episode, 1977
- Maurice Roëves
- Â Sub-Lt. Carwith 1 episode, 1977
- Damien Thomas
- Â Driss 1 episode, 1977
- Andy Bradford
- Â Lt. Scarf 1 episode, 1977
- James Greene
- Â Vice Chief of Naval Staff 1 episode, 1977
- Jack Watson
- Â Walter Perrin 1 episode, 1977
- Gerald Sim
- Â Cobbold 1 episode, 1977
- Patrick Durkin
- Â Mr. Parsons 1 episode, 1977
- Robert Gillespie
- Â NAAFI Manager 1 episode, 1977
- Prentis Hancock
- Â Insp. Fielding 1 episode, 1977
- Joanna Dunham
- Â Jenny Chelten 1 episode, 1977
- Frank Mills
- Â FOCAS 1 episode, 1977
- David Daker
- Â PO Asdale 1 episode, 1977
- Brian Croucher
- Â Ralph Perrin 1 episode, 1977
- John Bowler
- Â AB Robbins 1 episode, 1977
- Ronald Lewis
- Â Victor Chelten 1 episode, 1977
- Wei Wei Wong
- Â Lily Tan 1 episode, 1977
- Anthony Chinn
- Â Chang 1 episode, 1977
- Morris Perry
- Â Henry Witzel 1 episode, 1977
- John Quentin
- Â FOO 1 episode, 1977
- Patricia Garwood
- Â Chief Wren Callins 1 episode, 1977
- Clifford Rose
- Â Meryon 1 episode, 1977
- Judith Paris
- Â Arabella Ledson 1 episode, 1977
- John Stone
- Â Captain-in-Charge 1 episode, 1977
- Max Faulkner
- Â Chief Insp. Grainger 1 episode, 1977
- Ronald Leigh-Hunt
- Â Gage 1 episode, 1977
- Michael Lees
- Â Sg. Lt. Cmdr. Doyle RNR 1 episode, 1977
- Chris Quinten
- Â Dock Worker 1 episode, 1977
- Sebastian Abineri
- Â AB Blane 1 episode, 1977
- Stephen Bent
- Â Air. Burridge / ... 1 episode, 1977
- Vincent Wong
- Â MC 1 episode, 1977
- Ivor Roberts
- Â Lister 1 episode, 1977
- Fiesta Mei Ling
- Â Akiko 1 episode, 1977
- Jane Hayden
- Â Samantha Blane 1 episode, 1977
- Richard Cornish
- Â Lt. Proctor 1 episode, 1977
- John Rolfe
- Â Lodge 1 episode, 1977
- James Lister
- Â AB Gifford 1 episode, 1977
- Anthony Allen
- Â POMEM Harris 1 episode, 1977
- Maggie Riley
- Â Louise Witzel 1 episode, 1977
- Chas Bryer
- Â AB Tull 1 episode, 1977
- Trader Faulkner
- Â Cmdr. Hanley RNR 1 episode, 1977
- Pamela Sholto
- Â Mabel Gifford 1 episode, 1977
- Peter Williams
- Â Strudwick 1 episode, 1977
- Chris Williams
- Â Lt. Barr 1 episode, 1977
- Richard Borthwick
- Â L / ... 1 episode, 1977
- Michael Bangerter
- Â Capt. Bradman RM 1 episode, 1977
- Norman Atkyns
- Â Government Official 1 episode, 1977
- Charles Baillie
- Â Vince Weston 1 episode, 1977
- Roger Neil
- Â Amphibious Ops Officer 1 episode, 1977
- Alix Kirsta
- Â Airport receptionist 1 episode, 1977
- Richard McNeff
- Â Admiral's Secretary 1 episode, 1977
- Derek Slater
- Â Lillie 1 episode, 1977
- Anthony Gardner
- Â Lt. Cmdr. Lane 1 episode, 1977
- David Howe
- Â AB Wright 1 episode, 1977
- Anton Darby
- Â Lawson 1 episode, 1977
- Melville Jones
- Â Dawlish 1 episode, 1977
- Chris Bell
- Â Dockyard Worker 1 episode, 1977
- John Cannon
- Â Sailor (uncredited) 1 episode, 1976
