Part Four
Series Episode Number: 513World Premiere: Sat 20 Oct 1979 - 6:16pm BST [BBC One] (United Kingdom)
First Broadcast: Fri 27 Jul 2001 - 10:30pm CDT [Prairie Public Television]
Running Time: 25 minutes
16.10 Million (UK)
Appreciation Index: 64 (UK)Chart Position: 16 () (UK)
Recorded on Mon 04 Jun 1979 in Television Centre 6
Scaroth intends to travel back in time to save his own people from destruction. But the Doctor can't allow him to succeed as it would mean the destruction of all life on Earth.
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