 |
Tom Baker as The Doctor |
 |
Mary Tamm as Romana |
 |
John Leeson as K-9 (voice) |
 |
Cyril Luckham as The Guardian |
 |
Iain Cuthbertson as Garron |
 |
Nigel Plaskitt as Unstoffe |
 |
Paul Seed as Graff Vynda-K |
|
Robert Keegan as Sholakh |
 |
Timothy Bateson as Binro |
|
Anne Tirard as The Seeker |
 |
Prentis Hancock as Shrieve Captain |
| Directing | George Spenton-Foster | Director |
| Writing | Robert Holmes | Writer |
| Writing | Anthony Read | Script Editor |
| Production | Graham Williams | Producer |
| Sound | Dudley Simpson | Original Music Composer |
| Sound | Delia Derbyshire | Theme Song Performance |
