Is it going to be the Doctor’s defence that he improves?
Doctor Who seldom actually toys with temporality itself, treating time, broadly, as a setting rather than a concept or plot device to be explored. But by taking the Sixth Doctor “out of time” in order to conduct “The Trial of a Time Lord”—the fourteen episode story that makes up the entirety of Season Twenty-three—producer John Nathan-Turner creates an interesting, if ultimately risky, pivot for the series. Having been confronted with his supposed misdeeds in “The Mysterious Planet” and “Mindwarp,” the first two four-episode sub-stories in “The Trial of a Time Lord,” the Doctor draws, for his defense, on an event from his future instead of his past, in the form of Pip and Jane Baker’s “Terror of the Vervoids” (Story Production Code 7C Part 1), episodes nine through twelve of the season-long story.
This decision to present a story that happens in the Doctor’s own future serves two functions. Primarily, given the trial framing device that drives “The Trial of a Time Lord,” there’s no easy way, during a secret Gallifreyan trial conducted outside of time, to introduce a brand new companion to take Nicola Bryant’s place, with Peri having (seemingly) perished at the end of “Mindwarp“—the idea of a companion-less Doctor apparently beyond countenance for even a single episode. Thus, our first encounter with the future Sixth Doctor is of a winded Time Lord huffing and puffing on an exercise bike as Mel (Bonnie Langford) encourages him, part of an ongoing exercise regime. The easy banter and non-verbal interplay between Langford and Colin Baker suggests to viewers that Mel and the Doctor have had an extended series of adventures already.
More importantly for the overall story of “The Trial of a Time Lord,” this future-looking helps shatter the long-standing conceit of “Gallifreyan Standard Time,” that sense that although Time Lords can flit between past and future at will, there’s a consistent “present” time in which Time Lord history takes place, a continuum off limits to meddling via time travel. Up to now, the Doctor’s past has been linear and inviolable—the several meetings of the Doctor’s various regenerations notwithstanding. Otherwise, why not just pop back, for instance, and stop the death of the Lord President in “The Deadly Assassin,” once the Doctor uncovers the true murderer? Or whisk Adric off the doomed cargo ship before it plunges into Earth? Narratively speaking, the ability to simply undo anything that happens drains all the meaning from the stories on offer, which is why prior producers and writers have taken pains to prevent time travellers from revisiting their own timelines (qv. the Blinovich Limitation Effect). It’s a dangerous genie to let out of the bottle, prone to cheapening the Doctor’s efforts and sacrifices. But by this point, Doctor Who already having been placed on hiatus by the BBC once, Nathan-Turner seems willing to try just about anything.
So, suddenly, the Sixth Doctor finds himself plucked out of the time stream, but he somehow also continues on as though the trial has not yet taken place—otherwise, the events of “Terror of the Vervoids” could never have occurred, had he sequentially gone directly from the end of “Mindwarp” to the trial itself. Because they are recorded in the Matrix, the repository of all Gallifreyan knowledge and experience, pulled straight from the minds of Time Lords themselves, those events, and all the other unseen exploits of the Sixth Doctor and Mel, did/do/will happen; otherwise, they would not be there for the Doctor and the Valeyard (Michael Jayston) to call upon as evidence. He’s there and not there, Schrödinger’s Sixth Doctor.
When, exactly, does “The Trial of a Time Lord” take place? Simply put, out of time; that’s Nathan-Turner’s story, and he’s sticking to it. (Of note, long-serving Eric Saward departs as script editor after episode eight, resuming the duties for episode thirteen only—which was produced before “Terror of the Vervoids”—due to issues with the scripting of the final two episodes of the season, per Paul Kirkley’s irreverent history of Doctor Who, Space Helmet for a Cow. It’s all very confusing, much like “The Trial of a Time Lord” itself.)
By removing the Doctor from his own timeline, heretofore unthinkable temporal shenanigans become possible, and while they do not play much of a role in “Terror of the Vervoids”—which, more than the prior two sub-stories, finally begins to add substance to the trial framing device—the mere fact of the Doctor’s future being already written enables the main pay-off of “The Trial of a Time Lord” in the final two episodes. We still have Pip and Jane Baker’s four episodes to get through first, though.
What does happen in “Terror of the Vervoids,” then? Oh, just Murder on the Orient Express, in space, with violent plant creatures…