Episode Four
Series Episode Number: 282World 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 Television Centre 6
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.
Home Region: