- Michael Ripper - Jo Short
- Gerald Harper - Deputy Commander Rae Cox
- Christine Finn - Marjorie Bennett
- Alan Rothwell - Bill Rose
- Patsy Smart - Mrs. Samuels
- George Cole - Bishop
- Angela Baddeley - Mrs. Clark
- Pauline Yates - Mary Mason
- Bryan Pringle - John Stewart
- Michael Robbins - Smith
- Thomas Heathcote - Det. Chief Supt. Charles Appleby
- Ronald Lacey - Jerry Blake
- Harry Fowler - Ralph Maricut
- Edwin Richfield - Frank Dobson
- Gordon Jackson - Sgt. McKinnon
- Donald Sutherland - Philip Guest
- Gretchen Franklin - Martha Bray
- Royston Tickner - Charlie Berry
- Margery Mason - Mabel Short
- Ray McAnally - Mickey Keston
- Julian Holloway - Jim Richards
- Duncan Lamont - Divisional Supt. Smedd
- Glyn Houston - Sgt. Carmichael
- Michael Cashman - Syd Benson
- Suzan Farmer - Ada Lee
- Ian MacNaughton - Sgt. Greenwood
- Jane Merrow - Lollo Romano
- Henry McGee - Mack Martinson
- Alec Mango - Hartz
- Donald Pickering - 'Bookie' Barton Smith
- Lois Maxwell - Felisa Henderson
- Michael Craze - Vince Kelly
- Sandra Payne - Alice Short
- Virginia Maskell - Rose Lemman
- David Lodge - Morris
- Meredith Edwards - Paul Samuels
- Avril Elgar - Mrs. Tennison
- John Hurt - Freddy Tisdale
- Sydney Tafler - Gabriel Lyon
- Ann Bell - Netta Penn
- Esmond Knight - Robson
- Ray Brooks - Frank Romano
- Kay Walsh - Harriet Bright
- George Baker - Bailey
- Shelagh Fraser - Lady Copthorne
- Eric Barker - Robert Gresham
- Patrick Allen - 'Spender Todd'
- Finlay Currie - General Sir Hector McGregor
- Harold Goodwin - The Shopkeeper
- Trevor Bannister - PC John Moss
- George Sewell - Tim Murphy
- Sue Lloyd - Mary Henderson
- Allan Cuthbertson - Major Donald Ross
- Ian Fleming - Doctor
- Martin Boddey - Chief Officer Carmichael
- Harry Towb - Tod Cowan
- John Barrie - Will Rikker
- Alan Browning - Wilson
- Victor Maddern - Charles Randle
- John Martin - Det. Insp. Marsham
- Charles Lloyd Pack - Mr. Hunter
- Michael Standing - Ches Kelly
- Robert Brown - Bill Campbell
- Jack Gwillim - Commander Ripple
- Keith Baxter - Geoffrey Miles
- Raymond Huntley - Sir Percy Richmond
- Aubrey Richards - Det. Sgt. Steve Grady
- Arthur Lovegrove - Uncle Charley
- Jack MacGowran - 'Happy' Roden
- Megs Jenkins - Liz Rikker
- Noel Dyson - Mrs. Lane
- Barbara Couper - Jean Henderson
- George Murcell - Kautsky
- Norman Bowler - Michael Usher
- Joyce Grant - Margaret Gresham
- Gloria Paul - Lucy Sansetti
- Joe Gladwin - Finny
- Max Bacon - Bookie Thompson
- Dermot Kelly - Fingers
- Catherine Lacey - Sarah Fischer
- Victor Brooks - Supt. Ridgeway
- Sarah Lawson - Joan Erickson
- Johnny Sekka - Chay
- Jo Rowbottom - Mary Rose
- Norman Bird - Supt. Fred Lee
- Richard Carpenter - Michael Penn
- William Mervyn - Mr. Pater
- Basil Dignam - Commissioner Scott-Marle
- Alfie Bass - Max Fischer
- Roland Culver - Sir Arthur Vane
- Delphi Lawrence - Jane Kennet
- John Justin - Leonard Bright
- Oliver MacGreevy - The Contact Man
- Patrick Bedford - Casey
- Peter Reeves - Scooter Salesman
- John F. Landry - Tom Jenkins
- Clifford Earl - Sgt. Bailley
- Ann Lynn - Anne Beaumont
- Philip Ray - Langley
- Patricia English - Jean Cox
- Norman Scace - Warner
- Inigo Jackson - Leo Samson
- Peter Russell - John Hamilton
- Dyson Lovell - Peter Bennett
- Hilda Barry - Mrs. Critchley
- Norman Wynne - Mr. Gilliatt
- Joby Blanshard - Bill White
- Edward Dentith - Det. Insp. Dillon
- Penelope Horner - Janet Middleton
- Maurice Hedley - Colonel Alec Middleton
- Brian Phelan - Dandy Johnson
- John Glyn-Jones - Percy Knox
- Griffith Davies - Jimmy
- Michael Goodman - Ron Short
- Marjie Lawrence - Della Maricut
- John Dearth - Det. Supt. Warr
- Middleton Woods - Geoffrey Carr
- John Marcus Powell - PC Farley
- Angela Douglas - Morna
- Angela Douglas - Cathy Miller
- Lloyd Pearson - Doctor Wren
- Ray Barrett - Robert Carne
- Rosemary Leach - Marion Grove
- Justine Lord - Rina
- Timothy Bateson - Parker
- Howard Lang - Sergeant Fowler
- Graham Curnow - PC Awkwright
- Nora Gordon - Mrs. Harrow
- Jean Marsh - Sandra Casey
- Jean Marsh - Elspeth McCrae
- Kenneth Edwards - The Coroner
- Howard Douglas - Harry
- Walter Brown - John Borgman
- Tom Gill - Veterinarian
- Tom Gill - Hotel Manager
- Vanda Godsell - Charlotte Borgman
- Erica Rogers - Clare Selby
- John Gabriel - Cuthbertson
- Richard Davies - The Postman
- Richard Davies - Forensics Man
- Richard Davies - The Taxi Driver
- Maxwell Shaw - Mark 'Frisky' Lee
- Avis Bunnage - Mrs. Bessie Cowan
- Wensley Pithey - Supt. Bill Hemmingway
- Carmel McSharry - Mrs. Wray
- Alan Baulch - Peter Wray
- Andrea Allan - Pru Gideon
- David Davies - Sergeant Syd Taylor
- Michael Wynne - Alf
- Roy Hanlon - Jock
- John Horsley - Supt. Hopkinson
- Maggie Wright - Jean
- Richard Beale - Captain Vanner
- Michael Beint - Div. Insp. Marsh
- Anne Lawson - Ellen Winters
- George Merritt - The Janitor
- Donald Churchill - James Lane
- Brian Rawlinson - Duty Sergeant
- Kenneth Henry - Sir Edwin
- Don McKillop - Foreman
- Freda Bamford - Mrs. Kautsky
- Jeremy Burnham - Harold
- Reg Lye - Doctor Hill
- Pamela Conway - Phyllis Bailey
- Mike Pratt - Jensen
- Mike Pratt - Red Carter
- Julian Somers - Cameron
- Peter Williams - Control Tower Supervisor
- Jack Rodney - Shorty Fleming
- Jack Rodney - Taffy Jones
- John Hall - Sid Kautsky
- Frederick Bartman - Henry Waldo
- Donald Morley - Supt. Browning
- James Chase - Cowboy
- Patrick Durkin - Lefty
- Louis Mansi - Weasel
- Dervis Ward - Larry Larkin
- Dervis Ward - Keith Smith
- Keith Bell - Sammy
- Will Stampe - Tony Mazzo
- James Ottaway - Sideman
- Derren Nesbitt - John 'Benny' Benson
- Jennifer Wilson - Ruby Benson
- Ronald Adam - Sir Robert Copthorne
- Ronald Adam - Mr. Baker
- Sidney Vivian - Danny
- Vincent Harding - PC Lashbrook
- Jack Hedley - Bruce Carroway
- Sheila Allen - Mary Calloway
- Jennifer Daniel - Marjorie Bellman
- James Culliford - Eric Little
- Nicola Pagett - Cathy Bellman
- Geoffrey Palmer - Jeff Grant
- Michael Collins - Det. Supt. Brown
- Brian Weske - The Barrow Boy
- Brian Weske - Gerry Adams
- John Rae - The Pathologist
- Giles Watling - Malcolm Gideon
- David Gregory - Syd Carter
- David Gregory - Yob
- Elizabeth Counsell - Veronica Kendal
- Donald Houston - Tony Erickson
- Gordon Gostelow - Thompson
- Guy Ross - Michael Erickson
- Reginald Jessup - Det. Supt. Lemaitre
- Reginald Jessup - Det. Superintendent LeMaitre
- Gordon Whiting - Doctor Cooper
- Walter Horsbrugh - Jerome
- Bernard Brown - Ralph Mason
- Toni Palmer - Mrs. Endicott
- David Collings - Alan Campbell-Gore
- Fanny Rowe - Lady Campbell-Gore
- Gillian Lewis - Marjorie Hayling
- Rosemarie Dunham - Sophie Murdoch
- Richard James - Matthew Gideon
- Richard Burrell - Det. Sgt. Doug Brown
- Peter Jesson - Jack
- Arthur Pentelow - Mr. Lewis
- John Cairney - Captain Robbie McGregor
- David Hutcheson - Colonel McAlpine
- Michael Meacham - Captain James Murray
- Mary Yeomans - Ann Ross
- Guy Deghy - The Owner of Krootnings
- John Serret - Antoine Dubec
- Anthony Baird - Mr. Barnes
- Robert Sansom - The Magistrate
- Don Borisenko - Alan Blake
- David Bauer - Elliott Henderson
- Caron Gardner - Daisy
- Caron Gardner - Muriel
- Georgina Ward - Erica Townsend
- Lans Traverse - Nina Henderson
- Charles Carson - The Professor
- Alec Ross - Frank Simmons
- Victor Platt - Chief Insp. Budd
- Alita Naughton - Lydia Merritt
- Barry Lowe - Keston
- Anthony Bate - Doctor Kirk
- Ruth Trouncer - Helen Kirk
- Howard Knight - Chris Kirk
- Mary Quinn - Mary Murphy
- Tony Thawnton - Det. Insp. Smith
- Roger Foss - Mick
- Audrey Nicholson - Rachel Gully
- Patricia Burke - Mrs. Gully
- Madeleine Christie - Mrs. Moss
- Frederick Peisley - Tiny Bray
- Jolyon Booth - Radio Man
- Edward Evans - Fred Norton
- Clare Kelly - Mrs. Norton
- Carol White - Winifred Norton
- Anton Rodgers - Peter Sloane
- Derek Fowlds - Tim Coles
- Annette Andre - Sue Young
- Pauline Munro - Alison Clifton
- James Hunter - Tony King
- Roddy McMillan - Det. Insp. Caldwell
- Laurence Hardy - Dr. Coles
- Joyce Carey - Mrs. Coles
- Richard Hurndall - Mr. King
- Viola Keats - Mrs. King
- Harry Locke - Joe Moss
- John Tate - Bert Macey
- Robert S. Baker
- Monty Berman
Ronald Lacey hace el papel de Jerry Blake.
Timothy Bateson hace el papel de Parker.
John Gregson interpreta a Commander George Gideon en la serie.
Alexander Davion interpreta a Chief Insp. David Keen en la serie.
Daphne Anderson interpreta a Kate Gideon en la serie.
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