Don’t listen to me. I never do.
By the time Johnny Byrne’s “The Keeper of Traken” (Story Production Code 5T) airs, recurring antagonists no longer appear on Doctor Who with distressing inevitability, unlike earlier years when the Daleks were penciled in for at least one appearance per season and the Cybermen would fill in as needed. Producers Phillip Hinchcliffe and Graham Williams avoid old home week quite admirably during their tenures from Seasons Thirteen through Seventeen, bringing back only the Sontarans, the Daleks, and the Master from the Doctor’s dusty rogues’ gallery, and then only once each, the better to heighten their impact on the screen. In their stead, the Fourth Doctor faces fresh foes and new challenges aplenty, making Tom Baker’s run one of constant wonder and surprise.
Thus, at the start of the four episode story, as the Doctor and Adric confront the wizened form of the Keeper of Traken (Denis Carey), an amazingly powerful being capable of breaching the TARDIS thanks to the power of the Source, the audience expects another foray into the unknown. With the Keeper harnessing the Source, a quasi-mystical and ill-defined energy (not unlike the equally inexplicable Dodecahedron in “Meglos“), the Traken Union stands as a paragon of peace and tranquility, such that any evil being setting foot there calcifies and turns, slowly, to stone. This fate befalls the Melkur (Geoffrey Beevers), an ominous living statue that the Keeper warns the Doctor about while seeking the Time Lord’s help to prevent the Source from falling into malign hands.
Byrne, who cut his writing chops on Space: 1999, slowly and subtly introduces the real force behind the Melkur. In keeping with new producer John Nathan-Turner and new script editor Christopher H. Bidmead’s focus on rewarding long-time viewers, Byrne and director John Black dole out just enough hints in Episodes Two and Three for audience members steeped in series lore to realize that the Melkur is in fact a TARDIS belonging to none other than the Master, well before the renegade Time Lord’s presence explicitly manifests in the last ten minutes of the final episode.
Sadly, the impact of the Master’s return fizzles out by waiting so long to reveal him. His motivations receive short shrift indeed, boiling down to the Master’s de rigeur desire for conquest, revenge, and another regeneration. Far from matching wits with the Doctor, as in the finest battles between Jon Pertwee and the late Roger Delgado, the Master here simply waits in his moss-covered TARDIS, cackling occasionally and taking action only through others by dominating them mentally, such that the most dangerous figure for much of the story is an officious guard captain with an eye for a bribe…