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| Season: | 7 |
| Doctor: | Third Doctor |
| Companion | Liz Shaw |
| Original Airdate: | 3rd January - 24th January 1970 |
| Format: | 4 25-minute episodes |
| Production Code: | AAA |
| Writer: | Robert Holmes |
| Director: | Derek Martinus |
| Producer: | Derrick Sherwin |
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