Back The Invisible Enemy Spanish The Invisible Enemy French The Invisible Enemy Hungarian Невидимый враг (Доктор Кто) Russian The Invisible Enemy (Doctor Who) Turkish Neflen Nelogädik Volapuk
| 093 – The Invisible Enemy | |||
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| Doctor Who serial | |||
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Companions
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Guest
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| Production | |||
| Directed by | Derrick Goodwin | ||
| Written by | Bob Baker Dave Martin | ||
| Script editor | Robert Holmes | ||
| Produced by | Graham Williams | ||
| Executive producer(s) | None | ||
| Music by | Dudley Simpson | ||
| Production code | 4T | ||
| Series | Season 15 | ||
| Running time | 4 episodes, 25 minutes each | ||
| First broadcast | 1–22 October 1977 | ||
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The Invisible Enemy is the second serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 1 to 22 October 1977. The serial introduced the robot dog K9, voiced by John Leeson. In the serial, an intelligent virus intends to spread across the universe after finding a suitable spawning location on the moon Titan.