Doctor Who: The Androids of Tara

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.

Cast: Tom Baker, Mary Tamm, John Leeson, Peter Jeffrey, Simon Lack, Neville Jason