Finding the fourth segment of the Key to Time was simple enough, but holding onto it may be another matter. The Doctor and Romana find themselves embroiled in the political games of the planet Tara, where doubles, android or otherwise, complicate the coronation of Prince Reynart.
Tom Baker
as The Doctor
Mary Tamm
as Romana
John Leeson
as K-9 (Voice)
Peter Jeffrey
as Count Grendel
Simon Lack
as Zadek
Neville Jason
as Prince Reynart
Paul Lavers
as Farrah
Lois Baxter
as Lamia
Declan Mulholland
as Till
Cyril Shaps
as Archimandrite
