The Invasion of Time (6)

Mar 11, 1978 on BBC One at 5:15 PM
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Summary

The Sontarans finally invade the TARDIS itself, seeking the Great Key. The Doctor, however, has other uses for this powerful object…

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The Invasion of Time (5)
Season 15 Episode 25

Mar 04, 1978

Next episode

The Ribos Operation (1)
Season 16 Episode 1

Sep 02, 1978

Guest stars

Derek Deadman, Gai Smith, Hilary Ryan