- Mary Hignett - Mrs. Venables
- Michael Craze - Hyett
- William Lucas - Philip Chapman
- Frank Thornton - PC Cox
- Peter Birrel - Mick Bowyer
- Shelagh Fraser - Mary Tate
- Trevor Bannister - Eddie Farrell
- Geoffrey Hinsliff - Doctor
- Rodney Bewes - PC Screen
- Anton Diffring - Charles Mason
- Gretchen Franklin - Mrs. Walcott
- Walter Gotell - Gooch
- Talfryn Thomas - Hospital Porter
- Patrick McAlinney - Happy Day
- Richard Franklin - 2nd PBX Operator
- David Spenser - Chatterjee
- David Daker - Headmaster
- Michael Crawford - Howard Garland
- Bernard Fox - Smiler Hodges
- Guy Middleton - Fred Harper
- Ewen Solon - Captain Lewis
- Vernon Dobtcheff - Counsel for Defence
- Anna Wing - Mrs. Porter
- Denis Quilley - John Richard Everitt
- Derek Newark - Eddie Brown
- George Woodbridge - Jack Brasted
- Glyn Owen - Victor Davis
- Tommy Duggan - Billo Burke
- Lennard Pearce - Mr. Kemp
- Margaret John - Jenny
- Peter Purves - Brian
- Catherine Howe - Janet Sutcliffe
- George Layton - Billy Tate
- Roy Holder - Gordon Brown
- Mervyn Johns - Mr. Farmer
- John Rhys-Davies - Dunlop
- Muriel Pavlow - Anne Fulton
- Rita Webb - Ada Barnes
- Alan Lake - Ron Mason
- John Savident - Van Heerden
- Cyril Shaps - Green
- Kenneth Cope - Harold Tovey
- Barbara Shelley - Edwina
- Alan Tilvern - Morrie Finn
- Jim McManus - Vic
- John Salthouse - Cliff
- Angela Pleasence - Alice Benfield
- Brian Glover - Chuck Windell
- Cheryl Hall - Rita Batty
- John Carson - Joe Conway / Francis Spurling
- Isla Blair - Fleur Harris
- Donald Gray - Paul Merton
- Andrew Burt - PC Len Warren
- Clifford Rose - Bernie Katz
- Luan Peters - Marie
- Peter Craze - Bob Reynolds
- Peter Welch - Bill Forsdyke
- Peter Welch - Sgt. Kelly
- Geoffrey Keen - Det. Supt. Harvey
- Geoffrey Keen - John Armitage
- Ronald Leigh-Hunt - Brown
- Steven Berkoff - Dave Banks
- Glyn Houston - Woody
- Kevin Stoney - Bert Rogers
- Arnold Diamond - Assistant Hotel Manager
- Tom Baker - Foreman
- Tom Baker - The Man
- Prentis Hancock - Det. Sgt. Stainer
- Ralph Watson - Cyril
- Sean Connery - Joe Brasted
- Michael Goodliffe - Garfield Fenton
- Derek Martin - Len Drake
- Olaf Pooley - Mark Fuller
- Olaf Pooley - Captain Bailey
- Helen Fraser - Gwen
- Gwyneth Powell - Mrs. Regan
- Peter Denyer - Phil Bremmer
- Ray Barrett - Phil Burgh
- Royston Tickner - Bruce
- George Waring - Det. Supt. Robart
- Sylvia Coleridge - Mrs. Collins
- David Janson - Dave
- Tim Barlow - Boscombe
- Wendy Richard - Barbara Walker
- Wendy Richard - Jean Davis
- Floella Benjamin - Mrs. Dallas
- Brian Murphy - Percy Sinclair
- Sally Faulkner - Annabelle Sturmer
- Julian Glover - Lewis Naylor
- Martin Jarvis - Vic Hallan
- Christine Finn - Sheila Lane
- Clifford Earl - John
- Peter Forbes-Robertson - Mr. Smith
- Peter Forbes-Robertson - Informant
- Frank Middlemass - Billy the Tramp
- Frank Middlemass - Morrie
- Frank Middlemass - Scully
- Hamilton Dyce - Mr. Styler
- Patrick Holt - The Commander
- Jack Watling - Dick Hunt
- Jerold Wells - Henry Galloway
- Jerold Wells - Sgt. Muir
- Jerold Wells - Trotter Kelly
- Peter Stephens - Todd
- Earl Cameron - John Tate
- Desmond Llewelyn - Bank Manager
- Desmond Llewelyn - Dr. Pearce
- Desmond Llewelyn - Det. Insp. Jones
- Larry Martyn - Coffee Bar Attendant
- Patrick O'Connell - Nobby Clark
- Patrick O'Connell - Willy
- Patrick Mower - Clifford Abel
- Steve Plytas - Mr. Colly
- Patrick Godfrey - Dr. Hobbs
- Patrick Godfrey - Dr. Walsh
- Roger Lloyd Pack - Ron Fielding
- Sue Nicholls - Renee
- Sue Nicholls - Myra Close
- Maurice O'Connell - Frank Page
- Frederick Jaeger - John Charles Walton
- John Harvey - Col Ryman
- John Harvey - Mr. Harper
- John Harvey - Dr. Ingrams
- Chubby Oates - Terry
- Chubby Oates - Man with Dog
- June Whitfield - Marie
- Colin Douglas - Mr. Stevens
- Brian Wilde - Clayton
- Brian Wilde - Henry Brandon
- Martin Boddey - Mark Taylor
- Paul Darrow - Pearce
- Paul Darrow - Tony Kinsley
- George A. Cooper - Topper Brown
- George A. Cooper - Monty Pitman
- George A. Cooper - Jackson
- Neil McCarthy - Frankie Clark
- Michael Sheard - Night Porter
- Michael Sheard - Reporter
- Michael Sheard - 2nd Cabbie
- Michael Sheard - 1st Patrol Officer
- Carol Haddon - Hanni Jaeger
- Godfrey James - Foreman
- Godfrey James - Sgt. Dodds
- Godfrey James - Mellish
- Tom Adams - Jack Montelbetti
- Tom Adams - Charlie Mann
- Tom Adams - Johnny Orwell
- Jeremy Wilkin - Freddie
- Jeremy Wilkin - Harry Pilbeam
- Richard Davies - Milkman
- Richard Davies - Haines
- Richard Davies - Det. Chief Insp. Pearce
- Kenneth Watson - Det. Insp. Scott
- Kenneth Watson - Steve
- Kenneth Watson - Waring
- Kenneth Watson - Det. Chief Insp. Scott
- Kenneth Watson - Nobby Clark
- Kenneth Watson - Warden
- Harry Towb - Reg Bishop
- Harry Towb - Fred
- Jo Rowbottom - Julie Taylor
- Jo Rowbottom - Rosie Everett
- Jo Rowbottom - Joyce
- Stephen Greif - Tony
- Stephen Greif - Charles Negri
- Stephen Greif - Det. Chief Insp. Basset
- John Bennett - Victor Lane
- John Bennett - Malcolm Roberts
- Joan Ismay - Myra Ames
- Hal Galili - Bill Henderson
- Richard Shaw - Peter Morell
- Noel Howlett - Mr. Bodley
- Windsor Davies - Jack Winstone
- Windsor Davies - Vic Sharland
- Patrick Newell - Bill Jordan
- Patrick Newell - Tommy Carpenter
- Robert Raglan - Superintendent
- Robert Raglan - Herbert Franklin
- Robert Raglan - Judge
- Robert Raglan - Superintendent (uncredited)
- Graham Ashley - PC Tommy Hughes
- Graham Ashley - Det. Con. Tommy Hughes
- Graham Ashley - Det. Sgt. Tommy Hughes
- Graham Ashley - TV Enquiry Officer
- Bert Palmer - Mr. Cox
- June Brown - Brenda Walker
- Michael Brennan - Jack Kelly (uncredited)
- Michael Brennan - Jack Kelly
- Michael Brennan - Tiny Allbright
- Paul Eddington - Mr. Birch
- John Tate - Paddy O'Brien
- Robert Brown - Dick Hastings
- Michael Lees - Mr. Hayes
- Michael Collins - Mr. Hope
- Michael Collins - Harold Fuller
- Michael Golden - Sammy MacBride
- Michael Balfour - Bill Nelson
- Michael Balfour - Hobbs
- Michael Balfour - Joe Ward
- Michael Balfour - Nicky Medwin
- Michael Balfour - Pip Rutley
- Andrew Faulds - Jock MacPherson
- Terence Rigby - PC Smith
- Terence Rigby - PC Jacks
- Charles Lloyd Pack - Ben Waterfield
- Richard Vernon - Mr. Fellowes
- Richard Vernon - Mr. Pascoe
- Christopher Beeny - Jonty
- Richard Briers - Ken Tracey
- Anita Carey - Carol Hayward
- Colin Farrell - John Hayward
- John Junkin - Dan Stuart
- Aimée Delamain - Mrs. Lane
- Aimée Delamain - Miss Matty
- Barry Jackson - Bobby Brown
- Barry Jackson - Roy Sharp
- Barry Jackson - Joe
- Anthony Bate - PC Bert Scott
- Anthony Bate - PC Downing
- Anne Stallybrass - Mary Brown
- Jill Gascoine - Lorna McDermot
- Kenneth Waller - Dealer
- Jimmy Gardner - Higgins
- Jimmy Gardner - Sniffy Baker
- Jimmy Gardner - Charlie Wicks
- Michael Graham Cox - Brian Kent
- Michael Graham Cox - Davis
- Bernard Horsfall - John Harris
- Gerald Sim - Mr. Golding
- Gerald Sim - Police Surgeon
- Gerald Sim - Mr. Worth
- Ann Morrish - Lorna Harris
- Michael Stainton - Bert
- Michael Stainton - Bill Franklin
- Michael Stainton - Postman
- Michael Stainton - Hymie
- Michael Stainton - Len Regan
- Michael Stainton - Assistant Gaoler
- Michael Stainton - Harry
- Michael Stainton - 2nd Seaman
- Michael Stainton - Norman Duke
- Michael Stainton - PC Allen
- Michael Stainton - PC Thorpe
- Michael Stainton - Ward
- Michael Stainton - PC Cox
- Michael Stainton - Barnham
- Michael Stainton - Briggs
- Michael Stainton - Bus Driver
- Michael Stainton - Van Driver
- Michael Stainton - Mr. Farmer
- Thora Hird - Alice Leggett
- Glynn Edwards - David Caley
- Glynn Edwards - Det. Sgt. Frank Harvey
- Peter Diamond - Alexander Mackay
- John Phillips - Magistrate
- Scott Forbes - Ralph Frazer
- Nick Tate - Don Ross
- Ballard Berkeley - Joe Magnus
- Ballard Berkeley - Charles Devenish
- Ballard Berkeley - Colonel
- Ballard Berkeley - Mr. Briggs
- Ballard Berkeley - Mac
- Ballard Berkeley - Victor Dowson
- Ballard Berkeley - Harry Bates
- Ballard Berkeley - Mr. Noakes
- John Comer - Greengrocer
- Erik Chitty - Bert
- Erik Chitty - Tosh
- Erik Chitty - Nightwatchman
- Frank Mills - Milkman
- Ellis Dale - Mr. Carpenter
- John Bailey - Pavlo
- Richard O'Sullivan - Cris Patros
- Joan Hickson - Elsie Francis
- Jeremy Young - McCleod
- Candace Glendenning - Ruthy Melbourne
- Peter Bull - Arthur Coburn
- Leslie French - Bert Dunnett
- Vere Lorrimer
- Eric Fawcett
- Michael E. Briant
- Mary Ridge
- David Ellis
- Gerald Kelsey
- Derek Ingrey
- Ted Willis
- Robert Holmes
Steven Berkoff hace el papel de Dave Banks.
Neil McCarthy interpreta a Frankie Clark en la serie.
Vernon Dobtcheff interpreta a Counsel for Defence en la serie.
John Rhys-Davies interpreta a Dunlop en la serie.
Earl Cameron hace el papel de John Tate.
Sean Connery interpreta a Joe Brasted en la serie.
Julian Glover interpreta a Lewis Naylor en la serie.
Isla Blair interpreta a Fleur Harris en la serie.
Patrick Godfrey interpreta a Dr. Walsh en la serie.
Jack Warner hace el papel de PC George Dixon.
Capítulo disponible en las siguientes plataformas:
