Last updated 24 March 2024


Episode Four

Series Episode Number: 341

World Premiere: Sat 17 Mar 1973 - 5:50pm GMT [BBC One] (United Kingdom)
First Broadcast: Sun 19 Apr 1987 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 23 minutes 35 seconds

7.10 Million (UK)


Chart Position: 55 () (UK)

Recorded on Tue 17 Oct 1972 in TC3
Archive State: PAL 2 VT



The Doctor and Jo are the Master's prisoners. In a bid to escape, the Doctor makes a dangerous spacewalk.

Production Teamhide uncredited
WriterMalcolm Hulke
DirectorPaul Bernard
ProducerBarry Letts
DesignerCynthia Kljuco
Script EditorTerrance Dicks
Incidental MusicDudley Simpson
Special SoundDick Mills
Title MusicRon Grainer
Title Music BBC Radiophonic Workshop
Technical Manager (TM2)Tommy Dawson (uncredited)
Vision MixerMichael Turner (uncredited)
Floor AssistantChris Moss (uncredited)
Grams OperatorGordon Phillipson (uncredited)
Post Production SoundRay Angel (uncredited)
Costume DesignerBarbara Kidd (uncredited)
MakeupSandra Shepherd (uncredited)
Studio LightingRalph Walton (uncredited)
Studio SoundBrian Hiles (uncredited)
Visual Effects DesignerRhys Jones (uncredited)
Visual Effects DesignerBernard Wilkie (uncredited)
Masks byJohn Friedlander (uncredited)
Assistant Floor ManagerJohn Bradburn (uncredited)
Film CameramanJohn Tiley (uncredited)
Film EditorJohn Bush (uncredited)
Production AssistantNicholas John (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)
Production SecretarySarah Newman (uncredited)
Music CopyistGeorge Bayton (uncredited)
Artist BookingSybil Cave (uncredited)
Property BuyerRuth Hyde (uncredited)
AssistantKay Stephens (uncredited)