Last updated 24 March 2024


Part Four

Series Episode Number: 513

World 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.