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| Season: | 18 |
| Doctor: | Fourth Doctor |
| Companion | Adric |
| Nyssa | |
| Tegan | |
| Original Airdate: | 28th February - 21st March 1981 |
| Format: | 4 25-minute episodes |
| Production Code: | 5V |
| Writer: | Christopher H. Bidmead |
| Director: | Peter Grimwade |
| Producer: | John Nathan-Turner |
| Barry Letts |
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