- Chris Stanton
- Â Mr. Flatley / ... 87 episodes, 2007-2014
- Jonny Freeman
- Â Frank London / ... 65 episodes, 2009-2014
- Rachel Petladwala
- Â Rose Gupta 62 episodes, 2007-2011
- Channelle Owen
- Â Mrs. King / ... 52 episodes, 2009-2014
- Charlene Osuagwu
- Â Carrie Stewart 39 episodes, 2009-2011
- Ben Kerfoot
- Â Oscar Cole 39 episodes, 2009-2011
- Jenny Huxley Golden
- Â Avril Franklin 38 episodes, 2009-2011
- Eliza Cummings-Cove
- Â Davina Berry 38 episodes, 2009-2011
- Sam Melvin
- Â Scoop Doggy 37 episodes, 2009-2011
- Joe Cocklin
- Â Donovan Butler 37 episodes, 2009-2011
- Julian Bleach
- Â Grandmaster / ... 29 episodes, 2008-2013
- Oyiza Momoh
- Â Aneisha Jones / ... 26 episodes, 2013-2014
- Sam Strike
- Â Daniel Morgan / ... 26 episodes, 2013-2014
- Oscar Jacques
- Â Tom Tupper / ... 26 episodes, 2013-2014
- Paul Bamford
- Â Roly Donaldson 26 episodes, 2013-2014
- Bel Powley
- Â Daisy Millar 23 episodes, 2007-2008
- Moustafa Chousein-Oglou
- Â Blane Whittaker 23 episodes, 2007-2008
- Danny John-Jules
- Â Lenny Bicknall 23 episodes, 2007-2008
- Betty Denville
- Â Zara 23 episodes, 2007-2008
- Anthony Genas
- Â Homie Apathy 23 episodes, 2009-2011
- Jane Cameron
- Â Ms. Templeman 22 episodes, 2007-2008
- Rebecca Palmer
- Â Stella Knight / ... 22 episodes, 2007-2014
- Scott Gibbins
- Â Stewart Critchley 22 episodes, 2007-2008
- Sam Ardley
- Â Fifty Pence 22 episodes, 2007-2008
- Jonathan Rhodes
- Â Chief Agent Stark 16 episodes, 2010-2011
- Natasha Watson
- Â Zoe 13 episodes, 2013
- Julia Brown
- Â Keri 13 episodes, 2014
- Joshua Haynes
- Â Byron Ditchwater 13 episodes, 2013
- Megan McGill
- Â Lady J 13 episodes, 2014
- Sandy Bain
- Â Preston 13 episodes, 2014
- Princess Webb
- Â Letitia 13 episodes, 2008
- Pollyanna McIntosh
- Â Crime Minister / ... 13 episodes, 2013-2014
- Tallulah Greive
- Â Melissa Albright 12 episodes, 2013
- Brian McCardie
- Â Mr. McNab 11 episodes, 2013
- Leonie Boyd
- Â Kaleigh 10 episodes, 2007
- Adjoa Andoh
- Â Head of M.I.9 6 episodes, 2009-2011
- Kerry Shale
- Â The Grand Master / ... 6 episodes, 2007
- Finn Den Hertog
- Â Hamish Campbell / ... 5 episodes, 2014
- Brian Cox
- Â The Mastermind 5 episodes, 2013
- Rae Baker
- Â Jade Dixon Halliday 4 episodes, 2009-2011
- Liam Brennan
- Â Mike Stern 4 episodes, 2014
- Robert Llewellyn
- Â The Prime Minister 3 episodes, 2007-2008
- Krupa Pattani
- Â Newsreader 3 episodes, 2008-2010
- Anthony Bowers
- Â Prime Minster 3 episodes, 2014
- Forbes KB
- Â Henchman / ... 1 episode, 2009-2013
- Tracy-Ann Oberman
- Â Grand Mistress / ... 2 episodes, 2010-2011
- Jeremy Swift
- Â Fenton / ... 2 episodes, 2007-2009
- Andres Williams
- Â Lorenzo Farrago / ... 2 episodes, 2008-2009
- Tommy Bastow
- Â Lewis / ... 2 episodes, 2008
- Steven Meiklejohn
- Â The Worm 2 episodes, 2007-2008
- Richard Goulding
- Â Maurice Hutchinson 2 episodes, 2009-2010
- Quill Roberts
- Â Mr. Gupta 2 episodes, 2007
- David Charles
- Â Mr. Bailey / ... 2 episodes, 2008-2010
- Ricky Boleto
- Â Presenter 2 episodes, 2009
- Victoria Wicks
- Â Head of M.I.9 2 episodes, 2007
- Simon Greenall
- Â Al / ... 2 episodes, 2008
- Valentine Pelka
- Â French Defence Minister / ... 2 episodes, 2007-2009
- Johnny Austin
- Â Linus Currie 2 episodes, 2014
- Gavin Mitchell
- Â Edward Lambsbottom / ... 2 episodes, 2014
- Francesca Dymond
- Â Reporter 2 episodes, 2013
- Angus Barnett
- Â Brent Gilbert 1 episode, 2007
- Toby Regbo
- Â Chad Turner 1 episode, 2007
- Alex Ferns
- Â General Scarp 1 episode, 2007
- Kevin Eldon
- Â Space Controller 1 episode, 2007
- Simon Kunz
- Â Roger Powell 1 episode, 2007
- Rula Lenska
- Â Vanessa Zeitgeist 1 episode, 2007
- Steve Furst
- Â Tony Frisco 1 episode, 2007
- Simon Farnaby
- Â James Blonde 1 episode, 2008
- Abdul Salis
- Â Ben Lacey 1 episode, 2008
- Alastair Mackenzie
- Â Bruce Boardman 1 episode, 2008
- Felicity Montagu
- Â Big Sister / ... 1 episode, 2008
- Martin Hancock
- Â Charlie Chuckworth 1 episode, 2008
- Paul Reynolds
- Â Quentin Flake 1 episode, 2008
- Warwick Davis
- Â Per Trollberger 1 episode, 2009
- René Zagger
- Â Colt Winchester 1 episode, 2009
- Clare Buckfield
- Â Fleur Forna 1 episode, 2009
- Toby Longworth
- Â Dr. Vince 1 episode, 2009
- Richard Frame
- Â Andy 1 episode, 2009
- Nicholas Smith
- Â Professor Quakermass 1 episode, 2010
- Michael Culkin
- Â Mr. Pronting 1 episode, 2010
- Elize du Toit
- Â Sydney Barbour 1 episode, 2010
- Clint Dyer
- Â Abergavenny Smith 1 episode, 2010
- Paul Hawkyard
- Â Terry Zucker 1 episode, 2010
- June Whitfield
- Â Beryl Bagshot 1 episode, 2011
- William Beck
- Â Theo Phantom 1 episode, 2011
- Jane How
- Â Lady Blahga 1 episode, 2011
- Clara Salaman
- Â Dr. Carla Baxter 1 episode, 2011
- Siobhan Hewlett
- Â Sonya Frost 1 episode, 2007
- Moya Brady
- Â The Guinea Pig 1 episode, 2007
- Lachele Carl
- Â Professor Green 1 episode, 2007
- Michael Webber
- Â Dr. Grabwurst 1 episode, 2007
- Tai-Li Lee
- Â Lu, the Fugitive 1 episode, 2007
- Julian Gregory
- Â Crush 1 episode, 2007
- Louis Marlow
- Â Dylan Towser 1 episode, 2007
- Phil Cornwell
- Â Hugo Von Quark / ... 1 episode, 2008
- Colin McFarlane
- Â Maximus Fiticus 1 episode, 2008
- Alan Cox
- Â David DeHaverland 1 episode, 2008
- Brian Peck
- Â Mr. Bleaze 1 episode, 2008
- Sally Bankes
- Â Nora Braithwaite 1 episode, 2008
- Robin Pearce
- Â Charlie Darwin / ... 1 episode, 2008
- Troy Glasgow
- Â Mr B / ... 1 episode, 2008
- Darren Southworth
- Â Gesundheit 1 episode, 2008
- Ian Hughes
- Â Boris Ryfield 1 episode, 2008
- Hannah Waddingham
- Â Alannah Sucrose 1 episode, 2009
- Richard Brake
- Â Georgi 1 episode, 2009
- Jeff Rawle
- Â The Mole 1 episode, 2009
- David Robb
- Â Brian Gainsborough 1 episode, 2009
- Nigel Planer
- Â Prime Minister 1 episode, 2009
- Gareth Thomas
- Â Patrick Houston 1 episode, 2009
- Michael Shaeffer
- Â Butch 1 episode, 2009
- Cameron Jack
- Â Jed Black 1 episode, 2009
- Richard Katz
- Â Mr. Smith 1 episode, 2009
- Mia Clifford
- Â Agent X / ... 1 episode, 2009
- Edward Halsted
- Â Richter 1 episode, 2009
- Carolyn Pickles
- Â Linda Stoneaway 1 episode, 2010
- Silas Carson
- Â Well Fit Jim 1 episode, 2010
- Jake Curran
- Â Delivery Driver 1 episode, 2010
- Bruce Mackinnon
- Â The Octopus 1 episode, 2010
- Hermione Gulliford
- Â Andrea Ivanovic 1 episode, 2010
- Roger May
- Â Lars Von Tripod 1 episode, 2010
- Don Warrington
- Â Bodleian / ... 1 episode, 2011
- Kacey Ainsworth
- Â Margaret Fontana 1 episode, 2011
- Harry Landis
- Â Harry Fulson 1 episode, 2011
- Philip Fox
- Â Philip Blahga 1 episode, 2011
- Jenny Fitzpatrick
- Â Grey Ninja 1 episode, 2011
- Minnie Ayres
- Â Harriet 1 episode, 2011
- Tameka Empson
- Â Sergeant Raynor 1 episode, 2007
- Konnie Huq
- Â Blue Peter Presenter 1 episode, 2007
- Mark Bagnall
- Â Agent Zero 1 episode, 2007
- Ryan Gregory
- Â Crush 1 episode, 2007
- Holliday Grainger
- Â Leah Retsam 1 episode, 2008
- Robert Wilfort
- Â Nigel 1 episode, 2008
- Jemma McKenzie-Brown
- Â Irene Ryfield 1 episode, 2008
- John Warnaby
- Â James Brickman 1 episode, 2008
- Eileen Page
- Â Mrs. Hardy 1 episode, 2008
- Sion Tudor Owen
- Â Sir John St. John St. John 1 episode, 2008
- Chloe Hesar
- Â Evie Soloman 1 episode, 2008
- Shakira Ley
- Â Violet 1 episode, 2008
- Daniel Casey
- Â Chief Agent Shaw 1 episode, 2009
- Josef Altin
- Â Kranky 1 episode, 2009
- Louise Ford
- Â Katrina Houseman 1 episode, 2009
- David Nellist
- Â Ivor Luvabitz 1 episode, 2009
- Simon Meacock
- Â Fake Dr Wallis 1 episode, 2009
- Dean Gaffney
- Â Luke Withers 1 episode, 2009
- Ashley Lilley
- Â Venus Houston 1 episode, 2009
- Joe Tremain
- Â Button 1 episode, 2009
- Adam G. Goodwin
- Â Mad Dog 1 episode, 2009
- Kristina Godwin
- Â Lena Larsson 1 episode, 2009
- Gabriel Vick
- Â Cecil D. Miller 1 episode, 2010
- Chris Ryman
- Â Yves 1 episode, 2010
- Graham Bryan
- Â Agent Brown 1 episode, 2010
- Steven O'Neill
- Â Olaf Stein 1 episode, 2010
- Max Gell
- Â Toby Bleach 1 episode, 2010
- Ramon Tikaram
- Â Quillian Pendrix 1 episode, 2011
- Tony Gardner
- Â Prime Minister 1 episode, 2011
- Antonia Clarke
- Â Ricki 1 episode, 2011
- Danny Horn
- Â Vinnie 1 episode, 2011
- Hugh Futcher
- Â George 1 episode, 2011
- Simon Gregor
- Â Poopsberry 1 episode, 2011
- Joanna Brookes
- Â Patsy Stooge 1 episode, 2011
- Steve Edwin
- Â Steve Cobbs 1 episode, 2011
- Teresa Garratty
- Â Amber Bayes 1 episode, 2011
- Nicola Roffe
- Â Blue Ninja 1 episode, 2011
- Dallas Campbell
- Â AirOne Agent 1 episode, 2007
- Eliot Gregory
- Â Crush 1 episode, 2007
- Tim Downie
- Â Leo Taybridge 1 episode, 2008
- Marc Elliott
- Â Jerome 1 episode, 2008
- David Hounslow
- Â Abe Mason 1 episode, 2008
- Terry Bird
- Â Tyrone 1 episode, 2008
- Robert Gillespie
- Â Professor 1 episode, 2009
- Paul Shearer
- Â Real Dr Wallis 1 episode, 2009
- Georgina White
- Â Nadia 1 episode, 2009
- Ferdy Roberts
- Â Hector Swayne 1 episode, 2009
- Angus Harrison
- Â Raymond Stilt 1 episode, 2009
- Rebecca Hatch
- Â Chiante-Maria 1 episode, 2009
- Richard Harrington
- Â Tommy Blumenheck 1 episode, 2010
- Louisa Milwood-Haigh
- Â Hannah Stein 1 episode, 2010
- Roy Sampson
- Â Druid 1 episode, 2010
- Frankie McGinty
- Â Agent Zed 1 episode, 2010
- Derek Riddell
- Â Edward Dixon Halliday 1 episode, 2011
- Josephine Butler
- Â Paloma 1 episode, 2011
- Antonia Kinlay
- Â Sarah Kapalski 1 episode, 2011
- Charlie Hiett
- Â Elliot Cobbs 1 episode, 2011
- Michael Spicer
- Â Curator 1 episode, 2011
- Delena Kidd
- Â Hilda 1 episode, 2011
- Sian Williams
- Â Sian Williams 1 episode, 2011
- Lee Colley
- Â Chief Technician 1 episode, 2011
- Reena Lalbihari
- Â Pink Ninja 1 episode, 2011
- Sean Joseph Young
- Â Thomas 1 episode, 2011
- Stephen Ventura
- Â Egor 1 episode, 2011
- Stephen Bent
- Â Museum Guard 1 episode, 2007
- Michael Harbour
- Â British Defence Minister 1 episode, 2007
- Mark Powley
- Â Linus Miller 1 episode, 2008
- Julian Stolzenberg
- Â Pablo Domingo 1 episode, 2008
- Nicholas Clayton
- Â Chief Ninja 1 episode, 2008
- Luke de Lacey
- Â Benedict 1 episode, 2009
- Jared Ashe
- Â Lab Technician 1 episode, 2009
- Ashley House
- Â News Reporter 1 episode, 2009
- Lorna Beckett
- Â Agent Lil 1 episode, 2009
- Emily Head
- Â Brie 1 episode, 2010
- Akemnji Ndifornyen
- Â Pizza Delivery Man 1 episode, 2010
- Ben Bishop
- Â Legionnaire 1 episode, 2010
- Poppy Goodburn
- Â Anita Blackwell 1 episode, 2011
- Jeremy Vine
- Â Jeremy Vine 1 episode, 2011
- Chris Brandon
- Â Damon Travers 1 episode, 2011
- Guy Hescott
- Â Ashton 1 episode, 2011
- Seun Shote
- Â Hal McMasters 1 episode, 2011
- June Marlow
- Â Vera 1 episode, 2011
- Mark Dexter
- Â Dan Reynolds 1 episode, 2011
- Karen Dunbar
- Â Arme Connerssen 1 episode, 2013
- Simon Armstrong
- Â The Dark Wizard / ... 1 episode, 2013
- Louise Stewart
- Â Hyperia 1 episode, 2013
- Andrew Dallmeyer
- Â Carruthers 1 episode, 2013
- Jamie Jackson
- Â Sebastian J. Wilberforce 1 episode, 2013
- Stephen Boswell
- Â Museum Guard 1 episode, 2007
- Ryan O'Donnell
- Â Ninja 1 episode, 2008
- Steven Kynman
- Â Postman 1 episode, 2009
- Francis Ortega
- Â Elmer Pantry 1 episode, 2010
- Adelayo Adedayo
- Â Agent Suki 1 episode, 2011
- Matthew Ashforde
- Â Security Guard 1 episode, 2011
- Andy Akinwolere
- Â Andy Akinwolere 1 episode, 2011
- Diana Kent
- Â Jemima Thursday / ... 1 episode, 2013
- Caroline Chikezie
- Â Dr. Retentive 1 episode, 2013
- Phil McKee
- Â The Shadow Master 1 episode, 2013
- Ralph Riach
- Â Bodger 1 episode, 2013
- Daniel Tuite
- Â Cuthbert Peabody 1 episode, 2013
- Adura Onashile
- Â Doreen Doidge / ... 1 episode, 2013
- Mark Prendergast
- Â Bobby Bleach 1 episode, 2013
- James Heaford
- Â Nick Tesla 1 episode, 2013
- Greg Drysdale
- Â Janus 1 episode, 2013
- Joss Gillespie
- Â Grand Duke Nicholas 1 episode, 2013
- Jamie Michie
- Â Von Hades 1 episode, 2014
- Niall Greig Fulton
- Â Dark Wizard 1 episode, 2014
- Grace Chilton
- Â Agent Walker 1 episode, 2014
- Sean Brown
- Â Lloyd 1 episode, 2014
- Henry Lloyd-Hughes
- Â Kyle Whittaker 1 episode, 2007
- Paul Orchard
- Â Dom Jackson 1 episode, 2007
- Joy Brook
- Â Mrs. Gray 1 episode, 2008
- AG. Longhurst
- Â Taxi Driver 1 episode, 2008
- Imogen Bain
- Â Mrs Nolan 1 episode, 2010
- Robin Dunn
- Â Psychiatrist 1 episode, 2010
- Michael Winsor
- Â Basil Brush 1 episode, 2011
- Basil Brush
- Â Basil Brush 1 episode, 2011
- George A. Murphy
- Â 1950s Presenter 1 episode, 2011
- Fraser James
- Â General Grinder 1 episode, 2013
- Gordon Kennedy
- Â Edwin Grosse 1 episode, 2013
- Rhys Thomas
- Â Jimmy Jubbly 1 episode, 2013
- Richard James
- Â George Bland 1 episode, 2013
- Julie Austin
- Â Olga 1 episode, 2013
- James McAnerney
- Â Timosz 1 episode, 2013
- Sam Pamphilon
- Â Calvin Lame 1 episode, 2013
- Tony Donaldson
- Â SKUL Agent 1 episode, 2013
- Phil Gault
- Â Tough Guard 1 episode, 2013
- Grant O'Rourke
- Â Darren Beige 1 episode, 2014
- Allison McKenzie
- Â Vivian Glitch 1 episode, 2014
- Miltos Yerolemou
- Â Thalamus 1 episode, 2014
- Nick Farr
- Â Ron Scraper 1 episode, 2014
- Astrid Azurdia
- Â President Carlotta 1 episode, 2014
- Lois Mackie
- Â Sky 1 episode, 2014
- Dominic Applewhite
- Â Billy Snodgrass 1 episode, 2008
- Amy Booth-Steel
- Â Journalist 1 episode, 2008
- Caroline Bernstein
- Â The Queen 1 episode, 2008
- Dean Bardini
- Â Steve 1 episode, 2008
- John White
- Â Security Guard 1 episode, 2008
- Bill Aitchison
- Â Theodore Tilbury 1 episode, 2008
- Raef Bjayou
- Â Announcer 1 episode, 2011
- Harvey Robinson
- Â M19 Agent 1 episode, 2011
- Matthew Kelly
- Â Dr. Steinberg 1 episode, 2013
- Christine Steel
- Â Kloe 1 episode, 2013
- Graeme Rooney
- Â Security Guard 1 episode, 2013
- John Macauley
- Â SKUL Henchman #1 1 episode, 2013
- Callum Couston
- Â Spencer 1 episode, 2013
- Tupele Dorgu
- Â Mandy Pluckley 1 episode, 2014
- Paul Birchard
- Â George Monoblot 1 episode, 2014
- Stacey Edward Harris
- Â Phones 1 episode, 2014
- Timm Wylie
- Â Monster 1 episode, 2014
- Ronnie Simon
- Â Hayden 1 episode, 2014
- Bridget Mastrocola
- Â The Worm's Mum 1 episode, 2007
- Phil Cole
- Â Bus Driver 1 episode, 2007
- Cameron Neale
- Â Giles 1 episode, 2007
- Krishnan Naidoo
- Â Posh Johnny 1 episode, 2008
- Hugh Walters
- Â Old Man 1 episode, 2011
- Marj Hogarth
- Â Warden 1 episode, 2013
- Kimberly Neill
- Â Receptionist 1 episode, 2013
- Anne Downie
- Â Tap Dancing Lady 1 episode, 2014
- Isla Cowan
- Â Libi 1 episode, 2014
- Gary Cross
- Â Police Officer 1 episode, 2014
- Tobias Saltman
- Â Second Brave Kid 1 episode, 2007
- Evelyn Duah
- Â Policewoman 1 episode, 2008
- Christopher Brand
- Â Doorman 1 episode, 2008
- Tim Hewitt
- Â Journalist 1 episode, 2008
- Ashley Kumar
- Â Student Hoodie 1 episode, 2009
- Ruth McGhie
- Â Beryl 1 episode, 2013
- Paksie Vernon
- Â Reporter 1 episode, 2014
- Mandy Bhari
- Â Mrs. Deadman 1 episode, 2014
- Kay Lee
- Â The Spectre 1 episode, 2014
- Finlay Welsh
- Â Herbert Tesla 1 episode, 2013
- Randa Ray
- Â Mel (uncredited) 10 episodes, 2007
- Hollybeth Gourlay
- Â Naomi (uncredited) 3 episodes, 2013
- Chris Wilson
- Â M19 Officer (uncredited) 2 episodes, 2008
- Ray Donn
- Â Jeweller (uncredited) 1 episode, 2008
- Douglas Bunn
- Â Security Guard (uncredited) 1 episode, 2009
- Shaun Lucas
- Â Crowd Member / ... (uncredited) 1 episode, 2011
- Jerome Boyle
- Â PM Bodyguard (uncredited) 1 episode, 2011
- Robert Yates
- Â Evil Orderly (uncredited) 1 episode, 2013
- Allan Sutherland
- Â Combat performer / ... (uncredited) 1 episode, 2013
- Robert Maloney
- Â First Poisoned guard (uncredited) 1 episode, 2014
- Antony Scott
- Â Photographer (uncredited) 1 episode, 2014
- Gregor Gillespie
- Â Poisoned guard (uncredited) 1 episode, 2014
- Peter Adams
- Â Dancing Clone (uncredited) 1 episode, 2014
- Ronni Menzies-Stirling
- Â Scraper Bodyguard (uncredited) 1 episode, 2014