Episode Five
Series Episode Number: 287World Premiere: Sat 27 Feb 1971 - 5:15pm BST [BBC One] (United Kingdom)
First Broadcast: Thu 13 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 23 minutes 34 seconds
7.60 Million (UK)
Chart Position: 58 () (UK)
Recorded on Sat 19 Dec 1970 in Television Centre 3
Archive State: 16mm t/r
The Master forms an uneasy alliance with the Doctor so that between them they can subdue the Keller Machine which is now out of control.