Last updated 24 March 2024


Part Two

Series Episode Number: 620

World Premiere: Fri 9 Mar 1984 - 6:41pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 21 May 2015 - 8:30pm EDT [Retro TV]
Running Time: 25 minutes

6.60 Million (UK)


Chart Position: 75 () (UK)




Military captive Salateen tells Peri and the Doctor they are dying from spectrox toxaemia. The only cure is the milk of the queen bat who sleeps deep below the caverns.


Production Team hide uncredited
WriterRobert Holmes
DirectorGraeme Harper
ProducerJohn Nathan-Turner
DesignerJohn Hurst
Script EditorEric Saward
Title SequenceSid Sutton
Costume DesignerAndrew Rose
Make-up DesignerJohn Nethercot
Make-up DesignerShirley Stallard
Studio LightingDon Babbage
Studio SoundScott Talbott
Technical Co-ordinatorAlan Arbuthnott
Camera SupervisorAlec Wheal
Videotape EditorSteve Newnham
Visual Effects DesignerJim Francis
Visual Effects DesignerStuart Brisdon
Video EffectsDave Chapman
Vision MixerDiana Long
Film CameramanJohn Walker
Film SoundMalcolm Campbell
Film EditorRoger Guertin
Production ManagerElizabeth Trubridge
Production ManagerCorinne Hollingworth
Production Unit ManagerJune Collins
Production AssistantJuley Harding
Assistant Floor ManagerSue Hedden
Title MusicRon Grainer
Incidental MusicRoger Limb
Special SoundDick Mills
Sound/Music BBC Radiophonic Workshop
Design EffectsJohn Peyre
Title Music ArrangerPeter Howell (uncredited)
GripJohn Philips (uncredited)
Film Camera AssistantJohn Daley (uncredited)
Film LightingDes O'Brien (uncredited)
Film OperativeBrian Roots (uncredited)
Film OperativeRonnie Hewitt (uncredited)
Film OperativeMickey Ellis (uncredited)
Film Operations ManagerGraham Richmond (uncredited)
Visual Effects AssistantSimon Fullerlove (uncredited)
Visual Effects AssistantSimon MacDonald (uncredited)
Graphic DesignerIan Hewett (uncredited)
ChargehandJohnny Rice (uncredited)
Design AssistantMark Kerby (uncredited)
Floor AssistantAnna Campbell (uncredited)
Production SecretarySarah Lee (uncredited)
Costume AssistantAndrew Duckett (uncredited)
DresserPhilip Falconer (uncredited)
Property BuyerAlan Huxley (uncredited)
Make-Up AssistantJanet Phillips (uncredited)
DresserLiz Scammell (uncredited)