The Keeper of Traken

114^[a] – *The Keeper of Traken*
114 – The Keeper of Traken
Doctor Who serial
Cast
	Doctor Tom Baker – Fourth Doctor;
	Companion Matthew Waterhouse – Adric;
	Others Anthony Ainley – Tremas; Sarah Sutton – Nyssa; Denis Carey – The Keeper; Sheila Ruskin – Kassia; Geoffrey Beevers – The Master; John Woodnutt – Seron; Margot Van der Burgh – Katura; Robin Soans – Luvic; Roland Oliver – Neman; Liam Prendergast, Philip Bloomfield, Ralph Morse (uncredited) – Fosters;
Production
Directed by	John Black
Written by	Johnny Byrne
Script editor	Christopher H. Bidmead
Produced by	John Nathan-Turner
Executive producer(s)	Barry Letts
Music by	Roger Limb
Production code	5T
Series	Season 18
Running time	4 episodes, 25 minutes each
First broadcast	31 January 1981
Last broadcast	21 February 1981
Chronology
← Preceded by; Warriors' Gate	Followed by →; Logopolis
	List of episodes (1963–1989)

The Keeper of Traken is the sixth serial of the 18th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 31 January to 21 February 1981.

In the serial, the alien time traveller the Master (Geoffrey Beevers) seeks a power on the planet Traken known as the Source which he wishes to use to restore his life.

The end of the serial introduces Anthony Ainley as the Master. The serial is also the debut of Sarah Sutton as companion-to-be Nyssa.
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