While investigating a vanishing Concorde at Heathrow Airport, the Doctor and his companions are thrown millions of years back in time, when a mysterious alien called Kalid is trying to control the ancient powers of the Xeraphin.
The Doctor
Peter Davison
Nyssa
Sarah Sutton
Tegan Jovanka
Janet Fielding
The Master / Kalid
Anthony Ainley
Professor Hayter
Nigel Stock
Captain Stapley
Richard Easton
Flight Engineer Scobie
Keith Drinkel
First Officer Bilton
Michael Cashman
Captain Urquhart
John Flint
Angela Clifford
Judith Byfield
Horton
Peter Dahlsen
Sheard
Brian McDermott
Andrews
Peter Cellier
Adric
Matthew Waterhouse
Anithon
Hugh Hayes
Zarak
André Winterton