Last updated 24 March 2024

Episode One

Series Episode Number: 220

World Premiere: Sat 2 Nov 1968 - 5:15pm BST [BBC One] (United Kingdom)
Running Time: 24 minutes 32 seconds

7.30 Million (UK)

Appreciation Index: 55 (UK)

Chart Position: 55 () (UK)

Recorded on Fri 20 Sep 1968 in Lime Grove D
Archive State: Missing

The TARDIS lands in London where the Doctor, Jamie and Zoe agree to help find Isobel Watkins' missing uncle.

Searching for Professor Watkins at his last place of work, a multinational electronics supplier, he meets the company's managing director. He's not what he seems - and possesses alien technology in his office.