The quest is the quest.
Revolution seems to be in the air on Doctor Who in the late 1970s. No sooner do the Fourth Doctor and Leela wrap up a revolution on Pluto than they arrive at the edge of the universe to rouse another rabble in Bob Baker and Dave Martin’s “Underworld” (Series Production Code 4Y). The similarities between this story of class-based servitude and “The Sun Makers,” to say nothing of Baker and Martin’s last take on the topic, “The Mutants,” fades somewhat behind the blurry outline of all the green screen/color separation overlay effects that fill the story’s four episodes.
Rather than build extensive tunnel sets, director Norman Stewart (helming his first Doctor Who story) and the production crew call upon CSO to project our heroes, villains, and assorted throngs of oppressed people into a welter of warrens. Used sparingly, CSO creates a nice illusion; used frequently, as here, the seams show somewhat starkly. The overall effects work—in particular the worst space suits to ever appear in this, or any, science fiction series—might fairly be considered a failure, but the fractured storytelling on display here makes clear that no degree of perfection in the effects could have saved this tale.
Bob Baker and Dave Martin have always been given creative leeway by Doctor Who‘s producers. Barry Letts allowed them to conjure up the beautiful, golden, writhing Axons (and to stick Roger Delgado to a wall with tentacles) in “The Claws of Axos,” to say nothing of their invention of Omega and significant amounts of Time Lord canon in “The Three Doctors.” Philip Hinchcliffe, meanwhile, gave them leave to write the same role in two different genders in “The Hand of Fear,” a brilliant innovation that helps sell the complicated character of Eldrad. And in “Underworld,” Graham Williams, for his part, stands back as Baker and Martin offer an answer to a series-defining question: why do the Time Lords adhere to a policy of non-intervention?
Williams might have been better off demurring. To hear the Doctor tell it, some hundred thousand years ago, when the Time Lords were just starting to explore space-time, the Time Lords granted the Minyan civilization access to advanced Gallifreyan medical and weapons technology, which promptly led to their self-destruction. Ever since, the Time Lords have (mostly) refrained from interfering in the affairs of others, precisely to prevent another such catastrophe from occurring.
But prior to the destruction of Minyos, a colony ship containing the “race bank” of the Minyan people (shades of “The Ark in Space“) set out across the stars to establish a new home. It vanished, and for a hundred thousand years another Minyan ship has sought it out, on a quest to retrieve their “genetic inheritance” and restart the Minyan people on the inventively named Minyos 2. And just how did the crew survive for the hundred thousand years the quest has taken? Well, it turns out that the Time Lords shared one very particular secret with the Minyans…