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• The Invisible Enemy Played by: John Leeson
• The Invisible Enemy Played by: John Scott Martin
• The Invisible Enemy Played by: John Leeson
• The Invisible Enemy Played by: John Scott Martin

• Doctor Who - Season 15

• The Invisible Enemy - Part One Nucleus Voice John Leeson 1st Oct 1977
• The Invisible Enemy - Part Two Nucleus Voice John Leeson 8th Oct 1977
• The Invisible Enemy - Part Three Nucleus Voice John Leeson 15th Oct 1977
• The Invisible Enemy - Part Three Nucleus John Scott Martin 15th Oct 1977
• The Invisible Enemy - Part Four Nucleus Voice John Leeson 22nd Oct 1977
• The Invisible Enemy - Part Four Nucleus John Scott Martin 22nd Oct 1977