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After attempts to match the course of an asteroid for cover result in collision with the asteroid and severe damage to Scorpio's engines, the crew search for an experimental stardrive developed by an ex-Federation designer who is now working for a terrorist group.
First Air Date : Jan 02, 1978
Last Air date : Dec 21, 1981
Episode : 52 Episode
Season : 4 Season
Runtime: 50:14 minutes
Studio: BBC One
Country: