- Warren Mitchell - Brodney
- Bruce Boa - Bob Slade
- Gerald Harper - Colonel Corf
- Tenniel Evans - Dr. Hurst
- Ron Moody - Jordan
- John Comer - Groom
- Barry Warren - Melville
- Denis Shaw - Murray
- Peter Jones - Doyle
- Robert Urquhart - Maxwell
- Geoffrey Whitehead - Carter
- Jimmy Jewel - Maxie Martin
- John Savident - Winthrop
- Dudley Sutton - Dexter
- Joyce Carey - Harriet
- David Lodge - Policeman
- Guy Rolfe - Travers
- Warren Clarke - Trump
- Glynn Edwards - Blackie
- Grant Taylor - Merridon
- Robert Gillespie - Lift Attendant
- Peter Dennis - Private
- Robert Flemyng - Lord Maxted
- Noel Howlett - Prof. Rushton
- Cecil Parker - Glover
- Brian Wilde - Raven
- Donald Sutherland - Jessel
- Patricia Haines - Lola / Emma Peel
- Eunice Gayson - Lucille Banks
- Alister Williamson - Tom
- Imogen Hassall - Anjali
- Arthur Howard - Mr. Groves
- Arthur Lowe - Benstead
- Jack Gwillim - Sir David Harper
- T. P. McKenna - Grant
- James Villiers - Simon Trent
- Dyson Lovell - Warren
- John Gorrie - Tay-Ling
- Roger Hammond - Dr. Russell
- Sheila Fearn - Jenny
- Liz Fraser - Georgie Price-Jones
- Tom Adams - Grenville
- Alex Scott - Averman
- Edward de Souza - Flanders
- Edward Kelsey - Gerry
- Anneke Wills - Judy
- Angela Scoular - Myra
- Caroline Blakiston - Cynthia Wentworth-Howe
- Alan Lake - Karl
- Dinsdale Landen - Watney
- Tracy Reed - Janice
- Henry McGee - Maidwell
- Peter Vaughan - Jaeger
- Joss Ackland - Brigadier Hansing
- Richard Hurndall - Farrer
- John Paul - Wells
- Ray Brooks - Farrington
- Elizabeth Sellars - Laura
- John Cleese - Marcus Rugman
- Lucy Fleming - Emily
- Russell Waters - Pike
- Peter Stephens - Mr. Bellchamber
- Angela Douglas - Miranda
- Norman Jones - Zerson
- Valerie Leon - Betty
- William Job - Lord Edgefield
- John Crocker - Fothers
- Stratford Johns - Sidney
- John Wood - Twitter
- Isa Miranda - Damita Syn
- Arnold Ridley - Elderly Gent
- Tim Barrett - Salt
- Barrie Ingham - Unwin
- Michael Gough - Nutski
- Charlotte Rampling - Hana
- Trevor Bannister - Gordon
- Nosher Powell - Henrik
- William Fox - Simon Roberts
- Aimi MacDonald - Rosie
- Freddie Jones - Basil / John Steed
- Jerome Willis - George
- Peter Blythe - Mankin
- Gary Watson - Kendrick
- Ronald Radd - Shaffer
- Charles Tingwell - Dr. Neville
- Edwin Richfield - Alex
- Edwin Richfield - Barlow
- Philip Locke - Primble
- Francis Matthews - Chivers
- Steve Plytas - Kartovski
- Donal Donnelly - Vincent O'Brien
- John Carlisle - Peters
- Sheila Burrell - Mrs. Jupp
- Bernard Archard - Dr. Constantine
- Dennis Price - Jason
- Nicola Pagett - Adriana
- Patrick Barr - Stonehouse
- Michael Gwynn - Bill
- Gertan Klauber - Kruger
- Patsy Rowlands - Thelma
- Kathleen Byron - Miss Faversham
- Aubrey Richards - Professor Witney
- Kate O'Mara - Lisa
- John Woodvine - Seagrave
- Ewan Roberts - Travers
- Roy Kinnear - Happychap
- Roy Kinnear - Quilby
- Iain Cuthbertson - Kruger
- Patsy Smart - Mrs. Golightly
- Tony Selby - Stanley
- Yootha Joyce - Miss Lister
- David Langton - Sir James Arnall
- Norman Bowler - Mike
- Patrick Cargill - Pemberton
- Frank Maher - Nicholls
- James Hayter - Ticket Collector
- Brian Blessed - Mark Dayton
- Brian Blessed - Sergeant Hearn
- Peter Jeffrey - Prendergast
- Peter Jeffrey - Bristow
- Brian Murphy - Haslam
- John Phillips - Nesbitt
- Tony Caunter - Miller
- George A. Cooper - Burgess
- Sandra Dorne - Fiona Charles
- Jack Watson - Hopper
- Sandor Elès - Maurice Jubert
- George Murcell - Needle
- Griffith Jones - Baines
- Tony Steedman - Sir Joseph
- Willoughby Goddard - Truman
- Louise Pajo - Miss Craven
- Desmond Walter-Ellis - Manager
- Bryan Mosley - Armshith
- Liane Aukin - Miss Tiddiman
- Philip Bond - Caspar
- Michael Bilton - Dr. Winter
- Nigel Davenport - Lord Barnes
- James Maxwell - Jason Wade
- Ronald Hines - Dr. Haymes
- Gabrielle Drake - Angora
- Richard Leech - Col. Drew
- John Sharp - Prewitt
- John Sharp - Jupp
- Jon Pertwee - Brigadier Whitehead
- Isla Blair - Bride
- Marne Maitland - Becker
- Geoffrey Bayldon - Clapham
- Edward Underdown - Rupert
- Peter Copley - Sparshott
- Ferdy Mayne - Baron Von Orlak
- Christopher Benjamin - Whittle
- Christopher Benjamin - Swindin
- Frank Windsor - Tobin
- Allan Cuthbertson - Lord Melford
- Allan Cuthbertson - Webster
- Talfryn Thomas - Fiery Frederick
- Duncan Lamont - Wilks
- Michael Robbins - Henry Farrow
- Michael Robbins - Cavell
- Michael Culver - Price
- William Franklyn - Brinstead
- Anthony Ainley - Sunley
- Geoffrey Russell - Dexter
- Nicholas Smith - Lather
- Nicholas Smith - Parker
- Ronald Lacey - Strange Young Man
- Ronald Lacey - Humbert
- Timothy Bateson - Spencer
- Timothy Bateson - Merryweather
- Leon Greene - Freddy Richards
- Declan Mulholland - Saunders
- Peter Cushing - Paul Beresford
- Bruno Barnabe - Farrar
- Ray McAnally - Creswell
- Ray McAnally - Arcos
- John Hollis - Kanwitch
- John Hollis - Zoltan
- Colin Jeavons - Stanton
- Clive Dunn - Martin
- Eric Flynn - Croft
- Jane Merrow - Susan
- Hamilton Dyce - Camrose
- Paul Eddington - Beaumont
- William Kendall - Lord Dessington
- Charles Lloyd Pack - Dr. Fawcett
- Tony Wright - Keller
- John Cazabon - Mr. Maple
- John Stone - Major George Fancy
- John Stone - Victor Forsythe
- Tutte Lemkow - Gorky
- Ricardo Montez - Josino
- Frederick Jaeger - Benson
- Nigel Lambert - Doctor
- John Cater - Olliphant
- Vernon Dobtcheff - Spencer
- Vernon Dobtcheff - Stenson
- Kevin Stoney - Sir Gerald Bancroft
- Clifford Evans - Boyd
- Clifford Evans - Pelley
- Nicholas Courtney - Gifford
- Richard Young - Sir Jeremy Broadfoot
- Patrick Westwood - Taxi Driver
- George Merritt - James
- Judy Parfitt - Vesta
- Judy Parfitt - Loris
- Paul Whitsun-Jones - Sanders
- Kynaston Reeves - Dickens
- Peter Swanwick - Oppenheimer
- Lyndon Brook - Dr. Manx
- Lyndon Brook - Lyall
- Charles Farrell - Straker
- Margo Andrew - Caroline Evans
- Robert Russell - Lubin
- Donald Morley - One-Ten
- Donald Morley - Neame
- Mark Burns - Spence
- Caron Gardner - Bikini Girl
- Jack Lambert - McNab
- William Lucas - Brett
- William Lucas - Stapley
- Jimmy Gardner - Little Man
- Alan Browning - Zaroff
- Howard Marion-Crawford - Geoffrey
- Howard Marion-Crawford - Collins
- Marie Devereux - Dora Radosevick
- Patricia Denys - Cecile Dragna
- Peter Bowles - Thyssen
- Peter Bowles - Ezdorf
- Michael Coles - Verret
- Douglas Sheldon - Brad
- Richard Caldicot - Mellor
- Richard Caldicot - Admiral
- Moira Lister - Elena
- John Lee - Mark Pearson
- John Lee - Dr. Soames
- Harvey Hall - Ulrich
- John Nettleton - Sir Andrew Ford
- John Nettleton - Palmer
- Christian Roberts - Huxton
- John Ronane - Hubert
- John Ronane - Captain Tim
- Ronnie Barker - Cheshire
- Geoffrey Palmer - Paul Manning
- Anna Quayle - Olga
- Christopher Chittell - Bassin
- Douglas Muir - One Ten
- Douglas Muir - One-Ten
- Jon Rollason - Dr. Martin King
- Julie Stevens - Venus Smith
- Paul Danquah - Razafi
- Joy Webster - Stella Creighton
- Julian Glover - Peter Rooke
- Julian Glover - Masgard
- Julian Glover - Rupert
- Michael Lynch - Hadley
- Jeremy Lloyd - Bertram Smith
- Jeremy Lloyd - Teddy
- Kenneth Benda - Mansford
- Annette Carell - Dr. Voss
- Ruth Trouncer - Dr. Hill
- Peter Wyngarde - Stewart Kirby
- Phillip Ross - Hospital Attendant
- Edward Caddick - Sweeney
- Roger Booth - Tubby Vincent
- Rocky Taylor - Mitchell
- Ilona Rodgers - Samantha Slade
- Norman Chappell - Forbes
- Norman Chappell - Fowler
- Jack MacGowran - Professor Poole
- Roy Patrick - Julian
- Penelope Keith - Nanny Brown (credit only)
- Penelope Keith - Audrey Long
- Simon Oates - Skelton
- Simon Oates - Maskin
- A. J. Brown - Dawson
- Hilary Wontner - Dumayn
- Ann Sidney - Gerda
- Philip Madoc - Ivan
- Philip Madoc - Slater
- Pamela Ann Davy - Mandy
- Jack Woolgar - Kermit
- Michael Forrest - Peters
- Stanley Meadows - Erskine
- Frederick Treves - Dawson
- Brian Haines - Samuel Jones
- Reg Pritchard - Bellamy
- John Bailey - Ralph Bleech
- John Bailey - Fernand
- Neil McCarthy - Carl
- Neil McCarthy - Rasker
- Graham Armitage - Algy
- John Laurie - Crewe
- John Laurie - Juniper
- Edwin Apps - Winters
- Harold Kasket - Bartello
- Harold Kasket - Dr. Meitner
- Patricia English - Dr. James
- David Kernan - Eccles
- Bernard Horsfall - Fox
- Bernard Horsfall - Captain Smythe
- Geoffrey Reed - Carter
- Alan Chuntz - Selby
- Geoffrey Chater - Jarvis
- Geoffrey Chater - Seaton
- Karen Ford - Nurse
- John Bennett - Sykes
- John Bennett - Marson
- Jeremy Young - Dr. Penrose
- Jeremy Young - George Burton
- Kenneth J. Warren - Z.Z. von Schnerk
- Anthony Valentine - Cunliffe
- Anthony Valentine - Calvin
- Anthony Dawes - Actor
- Clifford Earl - Jarret
- Clifford Earl - Paxton
- Gary Hope - Joe Smith
- Terence Plummer - Toy Sung
- Margaret Neale - Stewardess
- Brian Oulton - Tait
- Drewe Henley - Groom
- Garfield Morgan - Gilbert
- Garfield Morgan - Manservant
- Garfield Morgan - Sexton
- Cardew Robinson - Mr. Puffin
- Cardew Robinson - Minister
- Paul Hardwick - Webster
- Geoffrey Sumner - General Wilmot
- Enid Lorimer - Nanny Roberts
- Louie Ramsay - Nanny Smith
- Arnold Diamond - Krelmar
- Arnold Diamond - Haller
- Andrew Keir - Crawley
- Andrew Keir - Col. James
- Dennis Chinnery - Dobson
- Nigel Green - The President
- Nigel Green - Sir Lexius Cray
- Campbell Singer - Major 'B'
- Peter Reynolds - Tulip
- Mark Eden - Nicholson
- Malcolm Taylor - Hooper
- Noel Coleman - Conroy
- Redmond Phillips - Hunt
- Barbara Shelley - Venus
- Barbara Shelley - Susan Summers
- Terry Richards - Cybernaut
- Paul Dawkins - Dr. Evans
- Peter Barkworth - Percy
- Peter Barkworth - Merlin
- Terry Yorke - Haynes
- Terence Maidment - Jepson
- Yolande Turner - Miss Pegram
- Hugh Manning - Max Hardy
- Hugh Manning - Major Star
- Pauline Delaney - Mrs. Rhodes
- Richard Curnock - Rhodes
- Robert James - Merlin
- Robert James - Ronnie Vance
- Robert James - Jenkins
- Yole Marinelli - Jerezina
- Adrian Ropes - Baines
- Adrian Ropes - Jennings
- Christopher Greatorex - Doctor
- Arthur Cox - Anaesthetist
- Arthur Cox - Clarke
- Jon Laurimore - Security Man
- Michael Rothwell - Kennel Man
- Eric Woofe - Assistant
- Philippe Monnet - Assistant
- Valerie Van Ost - Penny
- Roger Delgado - Kreer
- Roger Delgado - Vasco
- Penny Bird - Miss Peabody
- Gerry Crampton - Guest
- Leslie French - Rathbone
- Derek Newark - Crawford
- Derek Newark - Vickers
- Clifford Cox - Chalmers
- John G. Heller - Hinnell
- John G. Heller - Groski
- Leslie Crawford - Morgan
- Michael Latimer - Haworth
- Joanne Dainton - Miss Clarke
- Bill Wallis - Charles Grey
- Ann Hamilton - Receptionist
- Colin Blakely - Mickle
- Donald Pickering - Freddie Cartwright
- Donald Pickering - Peter Roberts
- Robert Cawdron - Banks
- Marijke Mann - Miss Avril
- Joanna Marie Jones - Hilda
- Joanna Marie Jones - Pandora
- David Glover - Wilton
- David Glover - Carson
- Irene Bradshaw - Maggie
- Joseph Greig - Higgins
- Geoffrey Colville - Jeremy Purser
- Ivor Dean - Bates
- Ivor Dean - Ferret
- John Chandos - Morgan
- Peter J. Elliott - Guest
- Peter J. Elliott - Williams
- Peter J. Elliott - Brad
- Peter J. Elliott - Attendant
- Stefan Gryff - Josef
- Peter Clay - Sergeant
- Edward Fox - Chilcott
- Cynthia Bizeray - Blonde
- Dinny Powell - Karl
- Patrick Kavanagh - Sean Mortimer
- Michael Nightingale - Real Colonel
- Michael Nightingale - Lucas
- Richard Owens - Perowne
- Richard Owens - Mechanic
- Beth Owen - Sally
- Tony Thawnton - Jenkins
- Edward Higgins - The Gardener
- Anthony Dutton - Dr. Garnett
- Anthony Dutton - Seligman
- Jonathan Elsom - Ackroyd
- Jonathan Elsom - Chattell
- Leon Lissek - Taxi Driver
- Peter Thomas - Saunders
- Peter Thomas - Kettridge
- Anthony Newlands - Brigadier Wishforth-Brown
- Rio Fanning - Lane
- Rio Fanning - Danvers
- Brian Badcoe - Cooty Gibson
- Andrew Laurence - Williams
- Andrew Laurence - Herrick
- Fulton Mackay - Glover
- Fulton Mackay - Professor Chadwick
- Fulton Mackay - Master
- Christopher Lee - Professor Stone
- Christopher Lee - Colonel Mannering
- Donald Gee - Vickers
- Anthony Blackshaw - Davis
- David Quilter - Wilson
- Alec Ross - Guard
- Roland Culver - Col. Timothy
- Valentine Dyall - Butler
- Kenneth Cope - Gardiner
- Kenneth Cope - Tom Savage
- Sylvia Kay - Matron
- Bette Bourne - Preece
- Fiona Hartford - Janice
- Jennifer Clulow - Georgina
- Peter Madden - Lasindall
- Willoughby Gray - Padley
- Noel Davis - Secretary
- Noel Davis - Carter
- Douglas Blackwell - Postman
- Steven Scott - Kartovski
- Maurice Good - Harry Mercer
- Iain Anders - Frank Compton
- John Kidd - The Butler
- Terence Alexander - Ponsonby
- Terence Alexander - 'Piggy' Warren
- Terence Alexander - Bromfield
- Anthony Nicholls - Ardmore
- Dudley Foster - Mr. Goat
- Dudley Foster - Parker
- Patrick Newell - Mother
- Patrick Newell - Sir George Collins
- Patrick Newell - Smallwood
- John Junkin - Sergeant
- John Junkin - Sheriff
- Dan Meaden - Sloman
- Michael Lees - Plummer
- Simon Lack - Nesbitt
- Arthur Pentelow - Dr. Grant
- Peter Jesson - Penman
- John Atkinson - Brayshaw
- Larry Burns - Gould
- Terry Eliot - Amanda
- Jeremy Burnham - Vicar
- Jeremy Burnham - Simon Filson
- Jeremy Burnham - Gordon White
- Edward Burnham - Meadows
- Edward Burnham - Brett
- Michael Trubshawe - Col. Withers
- Nora Nicholson - Miss Emily
- Robert Sidaway - Real Barlow
- Desmond Jordan - Guthrie
- David Grey - Williams
- Peter Elliott - Arkin
- John Bown - Roger
- John Moore - Williams
- John Moore - Greer
- Leon Thau - Ho Lung
- Vic Wise - Slattery
- Teddy Kiss Atom - Winkler
- William Lyon Brown - Dalby
- William Lyon Brown - Blind Man
- Peter Bromilow - Kafka
- Peter Halliday - Perrier
- Neil Hallett - Paul Ryder
- Neil Hallett - Arnie Packer
- John Glyn-Jones - Hyde
- Lawrence James - Cornwall
- Alfred Maron - Taxi Driver
- Julian Chagrin - Jennings
- Garry Marsh - Brigadier Wiltshire
- Bill Shine - Cleghorn
- Jay Denyer - Tenor
- Johnny Vyvyan - Escapologist
- Johnny Sekka - Col. Nsonga
- Jonathan Burn - Conrad
- Michael Turner - Crayford
- Roy Stewart - Giles
- Ian Ogilvy - Baron Von Curt
- William Ellis - Bruno
- Hal Galili - David Nadine
- Nicole Shelby - Helga
- Gloria Connell - Maid
- Michael Corcoran - Perova
- Ross Hutchinson - Chairman
- Reg Whitehead - Etola
- Sally Nesbitt - Ola
- Sally Nesbitt - Helen
- Anthony Sheppard - Georgio
- Angharad Rees - Redhead
- George Ghent - Mintoff
- John Baker - Vicar
- John Baker - Hallam
- David Sumner - Minnow
- Neil Stacy - Mullard
- Neil Wilson - Norton
- Cecil Cheng - Captain Soo
- Mark Elwes - Naval Officer
- Anne Rutter - Control Room Operative
- Anne Rutter - Betty
- Eric Barker - Pym
- Frank Middlemass - Mervyn Sawbow
- Dervis Ward - Sandford
- Harold Innocent - Parbury
- Toni Gilpin - Sonia
- Amy Dalby - Mrs. Forsythe
- Charles Morgan - Wainwright
- John Scott - Sir James Pendred
- Harry Hutchinson - Pendred's Servant
- Wendy Allnutt - Sarah
- George Roubicek - Grant
- Jennifer Croxton - Lady Diana Forbes-Blakeney
- Richard Wattis - Clarke
- Michael Ward - Freddie
- Harry Towb - Paxton
- James Bree - Arthur Wilkington
- Michael McStay - Trancer
- Charles Houston - Gillars
- Clive Graham - Lawson
- Oliver MacGreevy - Barman
- Penelope Horner - Jenny
- Donald Douglas - Major Parsons
- Philip Dunbar - Yates
- Anthony Bate - Earle
- Reginald Jessup - Dawson
- Liam Redmond - Charles Merrydale
- Brook Williams - Basil
- Sandra Tallent - Girl
- Veronica Strong - Martha Roberts
- Robert Harris - Sir Rodney
- Frank Gatliff - George Fryer
- Ann Rye - Policewoman Grimshaw
- Zulema Dene - Athene
- Norman Pitt - Basil Roxby
- David Baron - Metcalfe
- Larry Taylor - Freeman
- Robin Tolhurst - Tait's Secretary
- Gary Bond - Proctor
- Denise Buckley - Sally Unstrutter
- Henry Stamper - Major Glasgow
- Hugh Cross - Captain Andrews
- Elizabeth Robillard - Sally Graham
- Michael Hawkins - Shepherd
- Raymond Adamson - Condon
- Matthew Long - Holland
- Cliff Diggins - Howard Trent
- Wilfred Boyle - Vicar
- Terence Brady - Carstairs
- David Bird - Charles H. Osgood
- John Garrie - Wellbeloved
- Frederick Peisley - Rowley
- John Barrard - Grunner
- Frank Sieman - Concierge
- Bernard Severn - Knife Grinder
- Virginia Clay - Salesgirl
- Bernard Cribbins - Arkwright
- Bernard Cribbins - Bradley Marler
- William Marlowe - Fairfax
- Ralph Michael - General Hesketh
- Alan Wheatley - Dangerfield
- Bryan Marshall - Aubrey Phillipson
- Aimée Delamain - Miss Gladys Culpepper
- Nita Lorraine - Kate
- Ralph Ball - Hamilton
- Ken Barker - Powell
- Neville Marten - Pye
- Mary Merrall - Georgina
- Keith Baxter - Dunbar
- Edward Brayshaw - Fuller
- Mark London - Jackson
- Kristopher Kum - Osaka
- Bari Jonson - African Delegate
- Graham Ashley - Pub Landlord (uncredited)
- Graham Ashley - Gendarme
- Graham Ashley - Markin
- Kevork Malikyan - Rossi
- John Rapley - Taxi Driver
- Dora Reisser - Inge
- John Horsley - Dr. Grant
- Michael McKevitt - Phillips
- Harry Shacklock - Bill
- Derek Godfrey - Tobias
- Susan Travers - Nurse Owen
- Michael David - Reece
- Iris Russell - Sheila Dowson
- Iris Russell - Father
- Murray Hayne - Gibbons
- Tom Kempinski - Dyson
- David Garth - Dr. Farrow
- David Garth - Brevitt
- Hugh Moxey - Peregrine
- John Cairney - Firth
- Terence Sewards - Rista
- Alan MacNaughtan - Brandon (as Alan MacNaughton)
- Alan MacNaughtan - Gilpin
- Mike Lewin - Barrett
- Katya Wyeth - Jill
- Harvey Ashby - Bobby
- Hilary Pritchard - Circe
- Keith Buckley - Lomax
- Anthony Sagar - Clifford
- James Cossins - Henry
- Anthony Roye - Pettigrew
- Peter Bayliss - Dodge
- Reginald Barratt - Xavier Smith
- Terence Longdon - George Neville
- William Wilde - Baxter
- Michael Elwyn - Lt. Edwards
- John Hussey - Peters
- Barry Linehan - Magnus
- Vincent Harding - Rostov
- James Belchamber - Bryant
- Gerald Sim - Frederick Yuill
- Gerald Sim - Budge
- Gerald Sim - Kenneth
- Gerald Sim - Lovell
- James Kerry - Cordell
- George Innes - Shaw
- Michael Balfour - Tom
- Patrick Connor - Bob
- Ron Pember - Charley
- Jack Stewart - Thorne
- Philip Anthony - Sharp
- Philip Anthony - Cummings
- Juliet Harmer - Jill Manson
- Walter Horsbrugh - School Inspector
- Lucinda Curtis - Ann Meadows
- Janet Hargreaves - Sister Isobel
- Sarah Maxwell - Cafe Girl
- Rick Jones - Thug
- Justine Lord - Jeanette
- John Tate - Willie
- John Tate - Colonel Wesker
- Michael Collins - Technician
- Michael Collins - Detective Sgt
- Alan Curtis - Brand
- Angela Thorne - Receptionist
- Keith Barron - Technician
- Alfred Burke - Saunders
- Alfred Burke - Gregorio Auntie
- Alfred Burke - Brown
- Richard Vernon - Lord Matterley
- Mervyn Johns - Brandon Storey
- Anthony Booth - Dr. Kearns
- Walter Hudd - Dr. Clemens
- Allan McClelland - Broster
- Penelope Lee - Clarissa
- Marina Martin - Janet
- Ray Browne - Blakelock
- Clive Baxter - Nino
- Harry Fielder - Agent / Guard (uncredited)
- Peter Sallis - Hal Anderson
- John McLaren - Freedman
- Liam Gaffney - Michael Joyce
- Peggy Marshall - Mother Superior
- Elisabeth Murray - Deidre O'Connor
- Nigel Arkwright - Hughes
- Margo Jenkins - Margot
- Trevor Reid - Pilot
- Mollie Maureen - Kiosk Woman
- Denis Cleary - Ambulance Man
- Wilfred Grove - Male Nun
- Laurie Johnson
Peter Cushing interpreta a Paul Beresford en la serie.
Neil McCarthy hace el papel de Rasker.
John Laurie interpreta a Juniper en la serie.
Christopher Lee interpreta a Colonel Mannering en la serie.
Peter Vaughan hace el papel de Jaeger.
Roy Kinnear interpreta a Quilby en la serie.
Vernon Dobtcheff interpreta a Stenson en la serie.
Ronald Lacey interpreta a Humbert en la serie.
Michael Gough interpreta a Nutski en la serie.
Warren Clarke interpreta a Trump en la serie.
Capítulo disponible en las siguientes plataformas:
