Last updated 24 March 2024


Episode Six

Series Episode Number: 288

World Premiere: Sat 6 Mar 1971 - 5:15pm BST [BBC One] (United Kingdom)
First Broadcast: Fri 14 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 48 seconds

7.30 Million (UK)


Chart Position: 65 () (UK)

Recorded on Sat 19 Dec 1970 in Television Centre 3
Archive State: 16mm t/r



The Keller Machine breaks free of the Doctor's restraining device and the Doctor has no choice but to turn the parasite against the Master.