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.
as The Doctor
as Nyssa
as Tegan Jovanka
as The Master / Kalid
as Professor Hayter
as Captain Stapley
as Flight Engineer Scobie
as First Officer Bilton
as Captain Urquhart
as Angela Clifford
as Horton
as Sheard
as Andrews
as Adric
as Anithon
as Zarak
as Melkur
