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.
Peter Davison , Sarah Sutton , Janet Fielding , Anthony Ainley , Nigel Stock , Richard Easton , Keith Drinkel , Michael Cashman , Peter Cellier , Matthew Waterhouse
BBC
