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.

Cast:Peter Davison, Sarah Sutton, Janet Fielding, Anthony Ainley, Nigel Stock, Richard Easton,

Genre:Drama, Action, Adventure, Science Fiction, TV Movie,

country:United Kingdom,

Production:BBC,