[Susan Foreman]

Guest actors appearing in THE INVISIBLE ENEMY who have previously appeared in the show:

• Louise Jameson (Leela)
• Michael Sheard (Lowe)
• Brian Grellis (Safran)
• Jay Neill (Silvey)
• John Scott Martin (Nucleus)
• Frederick Jarger (Professor Marinus)
• Roy Herrick (Parsons)
• Pat Gorman (Medic)

Who: Before And After #590

Name: John Leeson [1943 - ] [Birth name: John Francis Christian Ducker]
Year(s): Doctor Who: 1977 – 1979 / 1980 – 1981 / 1983 / 1988 / 2006 / 2008 [63 episodes]
Stories: The Invisible Enemy Part 1 – The Armageddon Factor part 6 / The Leisure Hive part 1 / Meglos part 1 – Warriors' Gate part 4 / The Five Doctors / Remembrance Of The Daleks part 1 – Remembrance Of The Daleks part 3 / School Reunion / Journey's End
Character(s): K-9 / Voice Of The Nucleus [The Invisible Enemy part 1 – The Invisible Enemy part 4] / Dugeen [The Power Of Kroll part 1 – The Power Of Kroll part 4] / Voice Of The Dalek Battle Computer [Remembrance Of The Daleks part 1 – Remembrance Of The Daleks part 3]

Year(s): K-9 And Company: 1981 [1 episode]
Stories: A Girl's Best Friend
Character(s): K-9

Year(s): The Sarah-Jane Adventures: 2007 - 2010 [12 episode]
Stories: Invasion Of The Bane – Goodbye, Sarah-Jane Smith part 2
Character(s): K-9

Year(s): K-9: 2009 - 2010 [26 episode]
Stories: Regeneration – Eclipse Of The Korvan
Character(s): K-9

Note: Very active in the Whoniverse. Appeared as K-9 in:

• The Doctor Who mini-episodes Mini-episodes' Merry Christmas Doctor Who' and 'Dimensions in Time'
• The Sarah-Jane Adventures Mini-episode 'From Raxacoricofallapatorius with Love'
• The specials Specials 'The Weakest Link: Doctor Who Special', 'Pointless Celebrities: Doctor Who Special' and 'K9's Question Time'
• The Search Out Science episode 'Search Out Space'
• The Big Finish Fourth Doctor Adventures 'The Sands of Life' / 'Phantoms of the Deep' / 'The Dalek Contract' / 'The Final Phase' / 'The Exxilons' / 'Requiem for the Rocket Men' / 'Death Match' / 'The Fate of Krelos' / 'Return to Telos' / 'Wave of Destruction' / 'The Paradox Planet' / 'Legacy of Death' / 'The Trouble with Drax' / 'The Pursuit of History' / 'Casualties Of Time' / 'The Beast of Kravenos' / 'The Eternal Battle' / 'The Silent Scream' / 'The Mind Runners' / 'The Demon Rises' / 'Planet of the Drashigs' / 'The False Guardian' / 'Time's Assassin' / 'Fever Island' / 'The Perfect Prisoners' / 'Purgatory 12' / 'Chase the Night' / 'The Planet of Witches' / 'The Quest of the Engineer' / Shadow of the Sun'
• The Big Finish Novel Adaptations of 'The Romance of Crime' / 'The English Way of Death' / 'The Well-Mannered War'
• The Big Finish Dalek Universe story 'The Dalek Protocol'
• The Big Finish Companion Chronicles story 'The Time Vampire'
• The Big Finish Gallifrey stories 'Weapon of Choice' / 'Square One' / 'The Inquiry' / 'A Blind Eye' / ' Lies' / 'Pandora' / 'Insurgency' / 'Imperiatrix' / 'Fractures' / 'Warfare' / 'Appropriation' / 'Mindbomb' / 'Panacea' / 'Reborn' / 'Disassembled' / 'Annihilation '/ ' Forever' / 'Ascension
• The Big Finish Diary of River Song story 'A Forever Home'
• The BBV Adventures in a Pocket Universe stories 'The Choice' / 'The Search'

Away from the character of K-9, John Leeson has also appeared in:

• The Reeltime direct-to-video story 'Downtime' (as Anthony)
• The Big Finish Main Range story 'Revenge of the Swarm' (as the voice of the Nucleus / ComputerVoice)
• The Magic Bullet Kaldor City story 'Storm Mine'
• Read the Target Audiobook Novelisation releases of 'Doctor Who and the Ribos Operation' / 'Full Circle' / 'K9 and Company' / 'Doctor Who and the State of Decay' / 'Doctor Who and the Invasion of Time' / 'Doctor Who and the Invisible Enemy' / 'Doctor Who and the Sunmakers' / 'Warriors' Gate' / 'Doctor Who and the Armageddon Factor' / 'Doctor Who and the Underworld' / 'Meglos'
• Read the BBC Audiobook Novelisations of 'The Stones of Blood' / 'Shada' / 'The Androids of Tara'

Before Who:
Films: None
Television: Crossroads [12 episodes as Henri de Burgoyne (1967-1968)] / The Spanish Farm [2 episodes as Lt. Mansfield (1968)] / Albert!: The Verge of Stardom (1969) / Dad's Army: Sons of the Sea (1969) / The Doctors (1970) / On the House: Let My People Go (1970) / Take Three Girls: Duet for Two Left Feet (1971) / My Wife Next Door: What Are Friends For? (1972) / Rainbow [50 episodes as Bungle (1972)] / Comedy Playhouse: The Reverend Wooing of Archibald (1974) / Private Affairs: Husband to Mrs. Fitzherbert (1975) / Headmaster: The Public Image (1977) / The Foundation: Priorities (1977) / Crown Court: An Upward Fall (1977)

After Who:
Films: Tarka the Otter (1979), The Barretts of Wimpole Street (1982), Whoops Apocalypse (1986), Longitude (2000), Rebels Without a Clue (2010)
Television: Blake's 7: Mission to Destiny* (1978) / Blake's 7: Gambit (1979) / Jigsaw: Spring (1979) / The World About Us: Ring of Bright Water and Beyond Gavin Maxwell 1914-1969 (1979) / Prince Regent: Father and Son (1979) / Rings on Their Fingers [2 episodes as Mr. Simmonds (1979)] / Sorry! [3 episodes as Victor (1981)] / The Brief: Can Kill, No One to Kill (1984) / Oscar: Trials (1985) / Tucker's Luck: The Wedding (1985) / 'Allo 'Allo!: Flight to Geneva (1989) / Shadow of the Noose: Noblesse Oblige (1989) / The Bill: Out of the Mouths (1993) / Minder: Another Case of Van Blank (1994) / Bugs: Manna from Heaven (1995) / Vanity Fair (1998) / Doctors: A Parent's Right to Choose (2001) / ChuckleVision: Big Break (2007)