On screen
Cast
17 credited performers
Peter Davison
The Doctor
Sarah Sutton
Nyssa
Janet Fielding
Tegan Jovanka
Anthony Ainley
The Master / Kalid
Nigel Stock
Professor Hayter
Richard Easton
Captain Stapley
Keith Drinkel
Flight Engineer Scobie
Michael Cashman
First Officer Bilton
Artwork unavailable
John Flint
Captain Urquhart
Artwork unavailable
Judith Byfield
Angela Clifford
Artwork unavailable
Peter Dahlsen
Horton
Artwork unavailable
Brian McDermott
Sheard
Peter Cellier
Andrews
Matthew Waterhouse
Adric
Artwork unavailable
Hugh Hayes
Anithon
Artwork unavailable
André Winterton
Zarak
Graham Cole
Melkur