Last updated 09 January 2020


Part Four

Part Four

Series Episode Number: 435

World Premiere: Sat 23 Oct 1976 - 6:02pm BST [BBC One] (United Kingdom)
First Broadcast: Wed 14 May 1980 - 5:30pm CDT [WTTW 11 Chicago]
Running Time: 25 minutes

12.00 Million (UK)


Chart Position: 19 () (UK)

Recorded on Tue 20 Jul 1976 in TC8



On the dead world of Kastria, the Doctor and Sarah begin to suspect that Eldrad has not been entirely truthful with them.


Production Team hide uncredited
WriterBob Baker
WriterDave Martin
DirectorLennie Mayne
ProducerPhilip Hinchcliffe
DesignerChristine Ruscoe
Script EditorRobert Holmes
Costume DesignerBarbara Lane
Make-up ArtistJudy Neame
Visual Effects DesignerColin Mapson
Film CameramanMax Samett
Film RecordistGraham Bedwell
Film EditorChristopher Rowlands
Studio LightingDerek Slee
Studio SoundBrian Hiles
Special SoundDick Mills
Title SequenceBernard Lodge
Production Unit ManagerChris D'Oyly-John
Production AssistantMarion McDougall
Incidental MusicDudley Simpson
Title MusicRon Grainer
and the BBC Radiophonic Workshop
Technical ManagerFred Wright (uncredited)
Show Working SupervisorJohnny Norris (uncredited)
Vision MixerNick Lake (uncredited)
Inlay OperatorDave Chapman (uncredited)
Studio EngineerKen Ayres (uncredited)
Senior CameramanRonnie Peverall (uncredited)
Assistant Floor ManagerTerri Winders (uncredited)
Grams OperatorAndy Stacey (uncredited)
Design AssistantJudith Lang (uncredited)
Director's AssistantJoy Sinclair (uncredited)
Film Camera AssistantLaurie Bush (uncredited)
Film Sound AssistantJohn Pritchard (uncredited)
Lighting ChargehandDennis Johnson (uncredited)
Film Operations ManagerIan Brindle (uncredited)
Film OperativeJim Hering (uncredited)
Film OperativeJim Short (uncredited)
Film OperativeJohn Phillips (uncredited)
Film OperativeAlan Thompson (uncredited)
Film LightingAlan Muhley (uncredited)
Film LightingGeorge Best (uncredited)
Film LightingDave Child (uncredited)
Film LightingDave Gurney (uncredited)
GripStan Sweatman (uncredited)
Film UnitJohn Dymock (uncredited)
Film UnitJames Guest (uncredited)
Film UnitJames Hughes (uncredited)
Film UnitMary Weston (uncredited)
Film LocationsJennie Betts (uncredited)
DresserMervin Bezar (uncredited)
DresserGail Clarkson (uncredited)
Artist BookingNansi Davies (uncredited)
Artist BookingPhyllis Page (uncredited)
Make-Up AssistantJanet Gilpin (uncredited)
Make-Up AssistantJennifer Hughes (uncredited)
Make-Up AssistantCaroline O'Neil (uncredited)
Props BuyerRoger Williams (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Fight ArrangerMax Faulkner