Last updated 24 March 2024


Episode Three

Series Episode Number: 285

World Premiere: Sat 13 Feb 1971 - 5:15pm BST [BBC One] (United Kingdom)
First Broadcast: Tue 11 Nov 1975 - 6:30pm CST [WTTW 11 Chicago]
Running Time: 24 minutes 30 seconds

7.50 Million (UK)


Chart Position: 70 () (UK)

Recorded on Sat 05 Dec 1970 in Television Centre 8
Archive State: 16mm t/r



The Master is behind the Keller Machine and uses it to recruit the rioting inmates at Stangmoor Prison. He plans to capture a missile and fire it at the World Peace Conference.


Characters hide uncredited
Dr. WhoJon Pertwee
The MasterRoger Delgado
Brigadier Lethbridge-StewartNicholas Courtney
Jo GrantKaty Manning
Mike YatesRichard Franklin
Sergeant BentonJohn Levene
MailerWilliam Marlowe
VosperHaydn Jones
Prison GovernorRaymond Westwell
Dr. SummersMichael Sheard
Captain Chin LeePik-Sen Lim
Fu PengKristopher Kum
BarnhamNeil McCarthy
Chief Prison Officer PowersRoy Purcell
Senior Prison Officer GreenEric Mason
Corporal BellFernanda Marlowe
Prison OfficerBill Matthews
Prison OfficerBarry Wade
Prison OfficerDave Carter
Prison OfficerMartin Gordon
UNIT SoldierMichael Carter (uncredited)
Police InspectorRichard Atherton (uncredited)
UNIT SoldierRoger Marsden (uncredited)
Prisoner (Mind of Evil)Wolfgang Van Jergen (uncredited)
GuardLeslie Weekes (uncredited)
Main Gates PrisonerMatthew Walters (uncredited)
Master's chauffeurFrancis Williams (uncredited)
Prison OfficerGordon Stothard (uncredited)
Prison OfficerLes Conrad (uncredited)
PrisonerDennis Balcombe (uncredited)
PrisonerVal Musetti (uncredited)
StuntsAlan Chuntz (uncredited)
StuntsBilly Horrigan (uncredited)
StuntsMarc Boyle (uncredited)
StuntsMike Stevens (uncredited)
StuntsRoy Scammell (uncredited)
StuntsTerry Walsh (uncredited)