Last updated 24 March 2024


Episode Five

Series Episode Number: 287

World Premiere: Sat 27 Feb 1971 - 5:15pm BST [BBC One] (United Kingdom)
First Broadcast: Thu 13 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 23 minutes 34 seconds

7.60 Million (UK)


Chart Position: 58 () (UK)

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



The Master forms an uneasy alliance with the Doctor so that between them they can subdue the Keller Machine which is now out of control.


Production Team hide uncredited
WriterDon Houghton
DirectorTimothy Combe
ProducerBarry Letts
DesignerRaymond London
Script EditorTerrance Dicks
Special SoundBrian Hodgson (uncredited)
and BBC Radiophonic Workshop (uncredited)
Studio LightingEric Monk (uncredited)
Studio SoundChick Anthony (uncredited)
CostumesBobi Bartlett (uncredited)
Make-upJan Harrison (uncredited)
Visual Effects DesignerJim Ward
Fight Arranger HAVOC
Film CameramanMax Samett
Film EditorHoward Billingham
Incidental MusicDudley Simpson
Title MusicRon Grainer
and BBC Radiophonic Workshop
Production AssistantJohn Griffiths (uncredited)
Assistant Floor ManagerSue Hedden (uncredited)
Technical ManagerGraham Southcote (uncredited)
Vision MixerMike Catherwood (uncredited)
Floor AssistantJohn O'Shaughnessy (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)
Videotape EditorSam Upton (uncredited)
Videotape EditorRoger Harvey (uncredited)
Director's AssistantJohn Elliott (uncredited)