I think I pulled the wrong lever.
By the time “Full Circle” (Story Production Code 5R) first aired in late 1980, Doctor Who had been on the air for nearly seventeen years, enough time for a generation that grew up with the show to start participating in its creation. First time writer Andrew Smith (scarcely 18 at the time) and Matthew Waterhouse (nearly 19), as new companion Adric, both fit into this category, bringing an infusion of youthful, fannish vigor that dovetails with producer John Nathan Turner’s frenetic new vision for the series. The resulting four episode tale, however, with its copious technobabble, extended scenes in a laboratory, establishment of a multi-story plot line, and overall lack of an “actual” villain, feels more like an early Third Doctor tale than a late Fourth Doctor tale—and that’s not a bad thing.
The Doctor has always been a scientist at heart; for all the complaints about the Sonic Screwdriver and K-9 serving as easy plot devices to get our heroes out of any quandary, his inexhaustible store of technical and scientific knowledge saves the day far more often than the random contents of his pockets. Jon Pertwee’s Third Doctor leans into this aspect of the Doctor more than any other, so to have Tom Baker’s action-focused Fourth Doctor resolve a story’s basic conundrum by peering into a microscope rather than reversing a generator’s polarity or tricking a callow warlord into blowing up his own base provides a very refreshing callback, reflective, possibly, of Andrew Smith’s own experience of the Third Doctor’s exploits. At the very least, it’s reasonable to assume that he had seen far more Doctor Who than almost any other writer for the series.
“Full Circle” fits firmly that sub-genre of Doctor Who stories where the “monster” is just misunderstood, where blind obedience to an unthinking system serves as the real foe, and, crucially, where the resolution of the problem on offer is to realize it’s not actually a problem to be solved at all. Such stories require a deft hand at world-building and a nuanced approach to the various factions working at cross purposes, traits not often associated with John Nathan-Turner era stories, and the final product features far more running around corridors and incessant action sequences of stunt-men in latex suits flailing away with sticks than, say, “Doctor Who and the Silurians,” “The Ark,” or “The Massacre of St. Bartholomew’s Eve,” all of which inform “Full Circle,” even if at something of a remove. The core concept is there, though, of the Doctor seeing through surface level appearances, coming to understand the multi-generational cycle at work, and realizing the possible extents of co-existence; the best, and sometimes only, solution is to leave well enough alone, or failing that, to just leave.
The Doctor and Romana are themselves stuck, unable to leave E-Space, a problem that will persist for several stories running and form a loose through-line. The TARDIS arrives, confusingly, on the planet Alzarius instead of Gallifrey after encountering some space-time turbulence. The coordinates are correct for the Time Lords’ home planet—10-0-11-0-0 by 0-2—but they are negative coordinates instead of positive coordinates, an impossibility that can only be explained by the TARDIS having passed through a “charged vacuum emboitement” that pushed it into an Exo Space-Time Continuum. So instead of returning Romana to Gallifrey, whence she was summoned at the end of “Meglos,” they find themselves in a completely different universe, right at the pivotal point where a precocious maths student is about to purloin precious river fruit…