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The Doctor and Sarah reach Earth and try to warn the research centre about the Kraal invasion before Styggron unleashes his virus.
First Air Date : Nov 23, 1963
Last Air date : Dec 06, 1989
Episode : 694 Episode
Season : 26 Season
Runtime: 25:14 minutes
Studio: BBC One, BBC Television
Country: United Kingdom
Cast: Sylvester McCoy, Sophie Aldred
