Last updated 12 April 2026


Episode One

Series Episode Number: 135

World Premiere: Sat 5 Nov 1966 - 5:49pm GMT [BBC One] (United Kingdom)
First Broadcast: Sat 19 Nov 2016 - 8:25pm EST [BBC America]
Running Time: 25 minutes 43 seconds

7.90 Million (UK)

Appreciation Index: 43 (UK)

Chart Position: 44 () (UK)

Recorded on Sat 22 Oct 1966 in Riverside 1
Archive State: Missing



Ben and Polly suspect that the 'new' Doctor is really an imposter. The TARDIS lands on the planet Vulcan where a murder has been committed.

Production Teamhide uncredited
WriterDavid Whitaker
DirectorChristopher Barry
Additional materialDennis Spooner (uncredited)
ProducerInnes Lloyd
DesignerDerek Dodd
Story EditorGerry Davis
Incidental MusicTristram Cary
Title MusicRon Grainer
and the BBC Radiophonic Workshop
CostumesSandra Reid (uncredited)
MakeupGillian James (uncredited)
LightingGraham Sothcott (uncredited)
SoundBuster Cole (uncredited)
Special SoundBrian Hodgson (uncredited)
Assistant Floor ManagerMarjorie Yorke (uncredited)
Production AssistantMichael E Briant (uncredited)
Production AssistantGraeme Harper (confirmed)
Film CameramanPeter Sargent (uncredited)
Film EditorJim Latham (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)
Daleks created byTerry Nation (uncredited)
Grams OperatorLance Andrews (uncredited)