Part One
Series Episode Number: 488World Premiere: Sat 28 Oct 1978 - 6:24pm BST [BBC One] (United Kingdom)
First Broadcast: Sun 6 Sep 1981 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 24 minutes 20 seconds
8.60 Million (UK)
Chart Position: 38 () (UK)
Recorded on Mon 03 Jul 1978 in Television Centre 3
The Doctor and Romana track the third segment of the Key to Time to the vicinity of an ancient stone circle on Earth. But sinister forces are at work and the stones hide a secret.
| Characters include uncredited | ||
|---|---|---|
| Doctor Who |  | Tom Baker |
| Romana |  | Mary Tamm |
| Professor Rumford |  | Beatrix Lehmann |
| Vivien Fay |  | Susan Engel |
| Voice of K-9 |  | John Leeson |
| De Vries |  | Nicholas McArdle |
| Martha |  | Elaine Ives-Cameron |
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