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| Season: | 15 |
| Doctor: | Fourth Doctor |
| Companion | Leela |
| K9 Mk1 | |
| Original Airdate: | 1st October - 22nd October 1977 |
| Format: | 4 25-minute episodes |
| Production Code: | 4T |
| Writer: | Bob Baker |
| Dave Martin | |
| Director: | Derrick Goodwin |
| Producer: | Graham Williams |
Cast
Crew
Bad Guys
Story Notes
- This story was listed on the 1970s sound effects LP as "The Enemy Within"
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Duration
Ratings
Continuity
Cultural References
Influences
Location Filming
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Errors and Plot Holes
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Television
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Next story: Image of Fendahl |
All Media
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Next story: The Crimson Dawn |