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.


Production Team hide uncredited
WriterDerrick Sherwin
From a story byKit Pedler
DirectorDouglas Camfield
ProducerPeter Bryant
DesignerRichard Hunt
Script EditorTerrance Dicks
Incidental MusicDon Harper
Title MusicRon Grainer
and the BBC Radiophonic Workshop
Film CameramanAlan Jonas (uncredited)
Film Sound RecordistBill Chesneau (uncredited)
Film EditorMartyn Day (uncredited)
CostumesBobi Bartlett (uncredited)
Make-upSylvia James (uncredited)
LightingRobbie Robinson (uncredited)
SoundAlan Edmonds (uncredited)
Visual EffectsBill King (uncredited)
Visual Effects Trading Post (uncredited)
Special SoundBrian Hodgson (uncredited)
Production AssistantChris D'Oyly-John (uncredited)
Vision MixerDavid Langford (uncredited)
Grams OperatorRon Arnett (uncredited)
Technical ManagerDon Babbage (uncredited)
Director's AssistantSue Sly (uncredited)
Assistant Floor ManagerSue Willis (uncredited)
Floor AssistantMichael Ward (uncredited)
Film Operations ManagerHugh Wilson (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)