Last updated 24 March 2024


Part Four

Series Episode Number: 513

World Premiere: Sat 20 Oct 1979 - 6:16pm BST [BBC One] (United Kingdom)
First Broadcast: Fri 27 Jul 2001 - 10:30pm CDT [Prairie Public Television]
Running Time: 25 minutes

16.10 Million (UK)

Appreciation Index: 64 (UK)

Chart Position: 16 () (UK)

Recorded on Mon 04 Jun 1979 in Television Centre 6



Scaroth intends to travel back in time to save his own people from destruction. But the Doctor can't allow him to succeed as it would mean the destruction of all life on Earth.


Production Team hide uncredited
WriterDavid Agnew
WriterDouglas Adams (uncredited)
WriterGraham Williams (uncredited)
DirectorMichael Hayes
ProducerGraham Williams
DesignerRichard McManan-Smith
Script EditorDouglas Adams
Costume DesignerDoreen James
Make-up ArtistJean Steward
Visual Effects DesignerIan Scoones
Electronic EffectsDave Jervis
Vision MixerNigel Finnis
Videotape EditorRod Waldron
Studio LightingMike Jefferies
Studio SoundAnthony Philpott
Technical ManagerJohn Dean
Senior CameramanAlec Wheal
Film CameramanJohn Walker
Film RecordistGraham Bedwell
Film EditorJohn Gregory
Production AssistantRosemary Crowson
Production Unit ManagerJohn Nathan-Turner
Director's AssistantJane Wellesley
Assistant Floor ManagerCarol Scott
Incidental MusicDudley Simpson
Special SoundDick Mills
Grams OperatorScott Talbott (uncredited)
Floor AssistantSally Bates (uncredited)
Design AssistantSandy Garfield (uncredited)
Costume SupervisorJan Wright (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)
Model Set LightingHarry Oakes (uncredited)
Film Camera AssistantNiall Kennedy (uncredited)
Film Sound AssistantJohn Crossland (uncredited)
ElectricianDavid Gorringe (uncredited)
Film Operations ManagerIan Brindle (uncredited)
Film LocationsCarol Vigurs (uncredited)
DresserMichael Powell (uncredited)
Props BuyerValery Woodford (uncredited)
Booking AssistantPhyllis Page (uncredited)
Contract AssistantNansi Davis (uncredited)
Make-Up AssistantSally Woodlee (uncredited)
Make-Up AssistantMargaret Holding (uncredited)
Make-Up AssistantViv Riley (uncredited)
Show Working SupervisorChick Hetherington (uncredited)
GraphicsJoanna Ball (uncredited)
Title MusicRon Grainer (uncredited)
Title Music BBC Radiophonic Workshop (uncredited)