Last updated 24 March 2024


Episode One

Series Episode Number: 324

World Premiere: Sat 20 May 1972 - 5:50pm BST [BBC One] (United Kingdom)
First Broadcast: Wed 10 Dec 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 25 minutes 4 seconds

7.60 Million (UK)


Chart Position: 37 () (UK)

Recorded on Tue 25 Apr 1972 in TC3
Archive State: RSC conver



Masquerading as research scientist, Professor Thascales, the Master is using a device called TOMTIT to summon an ancient and powerful creature from beyond time.


Production Team hide uncredited
WriterRobert Sloman
WriterBarry Letts (uncredited)
DirectorPaul Bernard
ProducerBarry Letts
DesignerTim Gleeson
Script EditorTerrance Dicks
Studio LightingDerek Hobday
Studio SoundTony Millier
Film CameramanPeter Hamilton
Film SoundDerek Medus
Film EditorMartyn Day
Visual Effects DesignerMichaeljohn Harris
CostumesBarbara Lane
Make-upJoan Barrett
Special SoundBrian Hodgson
Music byDudley Simpson
Title MusicRon Grainer
and BBC Radiophonic Workshop
Assistant Floor ManagerRosemary Hester (uncredited)
Production AssistantMarion McDougall (uncredited)
Director's AssistantSue Upton (uncredited)
Film Camera AssistantColin Munn (uncredited)
Film Sound AssistantAlec Christison (uncredited)
GripBill Paget (uncredited)
Film OperativeJohn Phillips (uncredited)
Film OperativeJohn Rice (uncredited)
Film OperativeLee Turner (uncredited)
Film OperativeRay Davies (uncredited)
Costume AssistantDenis Adoo (uncredited)
Costume AssistantJean Cook (uncredited)
Design AssistantKen Ledsham (uncredited)
Make-Up AssistantJacki Block (uncredited)
Make-Up AssistantJean Steward (uncredited)
Music Sound SupervisorsAdrian Stocks (uncredited)
Music Sound SupervisorsRay Angel (uncredited)
Visual Effects AssistantCharlie Lumm (uncredited)
Visual Effects AssistantPeter Pegrum (uncredited)
Artist BookingCatriona Thompson (uncredited)
Artist BookingPhyllis Page (uncredited)
Artist BookingSybil Cave (uncredited)
Artist BookingSusan Hopkins (uncredited)
Title Music ArrangerDelia Derbyshire (uncredited)
Title SequenceBernard Lodge (uncredited)
Floor AssistantStephen Morris (uncredited)
Technical Manager(TM2)Frank Rose (uncredited)
Grams OperatorGordon Phillipson (uncredited)
Vision MixerShirley Coward (uncredited)