Last updated 24 March 2024


Part Four

Series Episode Number: 549

World Premiere: Sat 21 Feb 1981 - 5:12pm GMT [BBC One] (United Kingdom)
First Broadcast: Fri 3 Apr 2015 - 8:30pm EDT [Retro TV]
Running Time: 25 minutes 11 seconds

6.10 Million (UK)

Appreciation Index: 63 (UK)

Chart Position: 103 () (UK)

Recorded on Fri 21 Nov 1980 in Television Centre 8



Melkur has become the new Keeper of Traken and begins to access the source manipulator. As the Doctor takes steps to stop him, he discovers the frightening truth about his enemy.


Production Team hide uncredited
WriterJohnny Byrne
DirectorJohn Black
ProducerJohn Nathan-Turner
Executive ProducerBarry Letts
DesignerTony Burrough
Script EditorChristopher H Bidmead
Title SequenceSid Sutton
Costume DesignerAmy Roberts
Make-up ArtistNorma Hill
LightingDon Babbage
SoundJohn Holmes
Technical ManagerBob Hignett
Senior CameramanAlec Wheal
Videotape EditorRod Waldron
Visual Effects DesignerPeter Logan
Video EffectsDave Chapman
Vision MixerNigel Finnis
Production AssistantAlan Wareing
Production Unit ManagerAngela Smith
Director's AssistantJean Davis
Assistant Floor ManagerLynn Richards
Incidental MusicRoger Limb
Special SoundDick Mills
Grams OperatorJohn Relph (uncredited)
Floor AssistantJacqueline Morrish (uncredited)
Show Working SupervisorChick Hetherington (uncredited)
Props BuyerRobert Fleming (uncredited)
Lighting ChargehandJohn Morin (uncredited)
Lighting ChargehandPeter Pearse (uncredited)
Artist BookingNansi Davies (uncredited)
Studio EngineerGeorge Kinross (uncredited)
Studio EngineerDave Murphy (uncredited)
GraphicsIan Hewett (uncredited)
Make-Up AssistantSally Warren (uncredited)
Design AssistantJane Clement (uncredited)
Production SecretaryJane Judge (uncredited)
Title MusicRon Grainer (uncredited)
Title Music ArrangerPeter Howell (uncredited)
Studio SoundAlan Fogg