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| Season: | 15 |
| Doctor: | Fourth Doctor |
| Companion | Leela |
| K9 Mk1 | |
| Original Airdate: | 7th January - 28th January 1978 |
| Format: | 4 25-minute episodes |
| Production Code: | 4Y |
| Writer: | Bob Baker |
| Dave Martin | |
| Director: | Norman Stewart |
| Producer: | Graham Williams |
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Television
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Next story: The Invasion of Time |
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Next story: People of the Trees |
