Last updated 24 March 2024


Episode 3

Series Episode Number: 274

World Premiere: Sat 23 May 1970 - 5:15pm BST [BBC One] (United Kingdom)
First Broadcast: Fri 31 Oct 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 34 seconds

4.80 Million (UK)

Appreciation Index: 60 (UK)

Chart Position: 85 () (UK)

Recorded on Fri 08 May 1970 in TC3 / TC6
Archive State: RSC conver



Transported to a parallel world, the Doctor discovers that England is under military rule and the drilling project is at a more advanced stage.


Production Team hide uncredited
WriterDon Houghton
DirectorDouglas Camfield
ProducerBarry Letts
DesignerJeremy Davies
Script EditorTerrance Dicks
Film CameramanFred Hamilton
Film SoundGraham Hare
Film EditorMartyn Day
Visual Effects DesignerLen Hutton
Title MusicRon Grainer
and BBC Radiophonic Workshop
Stunt coordinator HAVOC
CostumesChristine Rawlins (uncredited)
Make-upMarion Richards (uncredited)
Studio LightingJohn Green (uncredited)
Studio SoundJohn Staple (uncredited)
Special SoundBrian Hodgson (uncredited)
Technical ManagerRay Hider (uncredited)
Vision MixerJohn Gorman (uncredited)
Grams OperatorTony Philpott (uncredited)
Production AssistantChris D'Oyly-John (uncredited)
Assistant Floor ManagerSue Hedden (uncredited)
Floor AssistantFrank Mullan (uncredited)
Make-Up AssistantJudy Cain (uncredited)
Make-Up AssistantSue Duckworth (uncredited)
Make-Up AssistantIrene Walls (uncredited)
Scene CrewBrian Mitchell (uncredited)
Scene CrewBrian West (uncredited)
Costume AssistantTerry Styles (uncredited)
Costume AssistantPat Trigger (uncredited)
Film Camera AssistantHugh Miles (uncredited)
Film Sound AssistantJack Curtis (uncredited)
Director's AssistantSue Upton (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)