Doctor Doctor Who Guide
Last updated 31 May 2015


Episode Four

Episode Four

Series Episode Number: 315

World Premiere: Sat 18 Mar 1972 - 5:50pm GMT [BBC One] (United Kingdom)
First Broadcast: Thu 20 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 21 seconds

7.80 Million (UK)


Chart Position: 40 () (UK)

Recorded on Tue 30 Nov 1971 in TC8
Archive State: PAL 2 VT



The Doctor attempts to persuade Captain Hart of the danger that the Master represents. Eager to make contact with the Sea Devils, the Doctor journeys deep into the ocean.


Characters hide uncredited
Doctor WhoJon Pertwee
MasterRoger Delgado
Jo GrantKaty Manning
Captain HartEdwin Richfield
TrenchardClive Morton
Commander RidgewayDonald Sumpter
Lt. Commander MitchellDavid Griffin
3rd Officer Jane BlytheJune Murphy
Ldg. Telegraphist BowmanAlec Wallis
C.P.O. SummersColin Bell
Lt. Commander WattsBrian Vaughan
Castle Guard DrewStanley McGeagh
Sea DevilPat Gorman
Stunt ManTerry Walsh (uncredited)
Stunt ManStuart Fell (uncredited)
Stunt ManMarc Boyle (confirmed)
Stunt ManMike Horsburgh (uncredited)
Stunt ManPeter Brace (uncredited)
Stunt ManMike Stephens (uncredited)
Chateau GuardJim Dowdall (uncredited)
Chateau GuardBrian Gilmar (uncredited)
Sea DevilSteve Ismay (uncredited)
Submarine RatingNick Llewellyn (uncredited)
Sea DevilBryan Nolan (uncredited)
Submarine RatingRoy Pearce (uncredited)
Submarine RatingDennis Plenty (uncredited)
Submarine RatingRon Tingley (uncredited)
Chateau GuardPhillip Weston (uncredited)
Sea DevilGeoffrey Witherick (uncredited)