Last updated 24 March 2024


Episode Four

Series Episode Number: 327

World Premiere: Sat 10 Jun 1972 - 5:50pm BST [BBC One] (United Kingdom)
First Broadcast: Mon 15 Dec 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 23 minutes 55 seconds

7.60 Million (UK)


Chart Position: 28 () (UK)

Recorded on Wed 10 May 1972 in TC4
Archive State: RSC conver



As UNIT forces approach, the Master leaves for Atlantis in his TARDIS. However, the Doctor is not far behind and in the time vortex, the two Time Lords confront each other.


Production Team hide uncredited
WriterRobert Sloman
WriterBarry Letts (uncredited)
DirectorPaul Bernard
ProducerBarry Letts
DesignerTim Gleeson
Script EditorTerrance Dicks
Film CameramanPeter Hamilton
Film SoundDerek Medus
Film EditorMartyn Day
Visual Effects DesignerMichaeljohn Harris
Special SoundBrian Hodgson
MusicDudley Simpson
Title MusicRon Grainer
and BBC Radiophonic Workshop
Studio LightingDerek Hobday (uncredited)
Studio SoundTony Millier (uncredited)
CostumesBarbara Lane (uncredited)
Make-upJoan Barrett (uncredited)
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)