

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.
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Cast

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
John Flint
Captain Urquhart
Judith Byfield
Angela Clifford
Peter Dahlsen
Horton
Brian McDermott
Sheard
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