The final segment of the Key to Time is at the heart of a devastating war between neighbouring planets Atrios and Zeos. The Fourth Doctor discovers that a sinister entity is manipulating events and the cost of obtaining the final segment may be more personal than he imagined.
Cast
Tom Baker
The Doctor
Mary Tamm
Romana
John Leeson
K-9 (voice)
John Woodvine
Marshal
Lalla Ward
Princess Astra
Davyd Harries
Shapp
Ian Saynor
Merak
Ian Liston
'Hero'
Susan Skipper
'Heroine'
John Cannon
Guard
Iain Armstrong
Technician
Pat Gorman
Pilot
Harry Fielder
Guard
William Squire
The Shadow
Barry Jackson
Drax
Valentine Dyall
The Black Guardian
Crew
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