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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.
Length 150 minutes
Tom Baker | Mary Tamm | John Leeson | John Woodvine | Lalla Ward | Davyd Harries | Ian Saynor | Ian Liston | Susan Skipper | John Cannon | Iain Armstrong | Pat Gorman | Harry Fielder | William Squire | Barry Jackson | Valentine Dyall