Part One
Series Episode Number: 518World Premiere: Sat 24 Nov 1979 - 6:01pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 1 Nov 1981 - 11:00pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 17 seconds
8.70 Million (UK)
Chart Position: 41 () (UK)
Recorded on Sun 12 Aug 1979 in Television Centre 6
A terrible hyperspace accident results in two starships becoming locked together. The Doctor arrives and discovers that the incident may have also released a deadly menace.
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