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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.
February 24, 1979
BBC
16 people
Tom Baker
The Doctor
Acting
Mary Tamm
Romana
Acting
John Leeson
K-9 (voice)
Acting
John Woodvine
Marshal
Acting
Lalla Ward
Princess Astra
Acting
Davyd Harries
Shapp
Acting
Ian Saynor
Merak
Acting
Ian Liston
'Hero'
Acting
Susan Skipper
'Heroine'
Acting
John Cannon
Guard
Acting
Iain Armstrong
Technician
Acting
Pat Gorman
Pilot
Acting
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