Last updated 09 January 2020

Episode Four

Episode Four

Series Episode Number: 282

World Premiere: Sat 23 Jan 1971 - 5:16pm BST [BBC One] (United Kingdom)
First Broadcast: Mon 27 Oct 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 22 minutes 10 seconds

8.40 Million (UK)

Chart Position: 59 () (UK)

Recorded on Sat 24 Oct 1970 in TC6
Archive State: PAL Restor

The Doctor and UNIT race to prevent the Master from broadcasting the deadly activation signal and opening the channel for the Nestene's arrival on Earth.