31 January 1981
Anthony Ainley (Tremas*), Sheila Ruskin (Kassia), Sarah Sutotn (Nyssa), Denis Carey (The Keeper) [1-2], John Woodnutt (Seron) [1-2], Margot van der Burgh (Katura), Robin Soans (Luvic), Roland Oliver (Neman), Geoffrey Beevers (Melkur)*; Liam Prendergast , Philip Bloomfield  (Fosters)
|Written by||Johnny Byrne|
|Directed by||John Black|
|Produced by||John Nathan Turner|
The Union of Traken is governed by a Keeper gifted with the powers of the Source. The current Keeper is nearing the end of his thousand-year tenure, however, and asks the Doctor and Adric — who have escaped from E-Space — to go to Traken and stop an evil he believes is plotting to destroy the Union.
But the source of the evil, the Melkur, has already infiltrated the Consuls of Traken, and has the Doctor declared a criminal. Allying himself with Consul Tremas and his daughter, Nyssa, the Time Lord must uncover the true power behind the Melkur — someone who knows the Doctor of old.
- This is the first part in the Return of the Master trilogy, which continues in Logopolis and concludes in Castrovalva.
- Nyssa reutrns in the following story, Logopolis, when a shadowy version of the Doctor’s next self saves her before Traken’s destruction.
- Adric applies a Fourier analysis on the energy readings from the Melkur
- There is some confusion as to what exactly Tremas’s body is to the Master. While it appears that it now houses the Master’s mind, another theory is that its simply superimposed, if you like, over the Master’s corpse, and kept alive by the dying embers of the Source of Traken, as speculated in The Quantum Archangel.
- The Doctor has already met an older version of Nyssa in Asylum.
- * Anthony Ainley will resume regular appearances as the Master
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