It’ll be something devious and overcomplicated.
Every great hero comes matched to an equally great adversary: Holmes and Moriarty, Superman and Lex Luthor, Tom and Jerry, Kirk and Khan. For the Doctor, that iconic foe, that near-platonic opposite, comes not in the form the Daleks or the Cybermen, worthy opponents though they may be, but in the Master, the renegade Time Lord gifted with all the Doctor’s own advantages, from intellect to regeneration to a TARDIS. Their duels hold legendary status in Doctor Who, but also show a decidedly one-way record of victories in favor of Gallifrey’s favorite son, making for rousing storytelling but rather anticlimactic narratives. Pip and Jane Baker, established British TV writers penning their first of several Doctor Who tales, introduce a complication to the usual pas de deux in “The Mark of the Rani” (Story Production Code 6X), adding the Rani (Kate O’Mara), an amoral, exiled Time Lord, into the mix with their two episode, ninety-minute story, turning the typically double-sided affair into a Time Lord triangle. She doesn’t like either of them one bit, and the feeling is mutual all the way around.
A brilliant chemist, the Rani sets up shop in a Victorian mining town during the tumult of the Luddite riots, draining a brain fluid from miners who think they are going for a bath after a long shift; the chemical activates the brain’s sleep centers, and without it the victims turn into rambunctious, hyperactive louts whose behavior can be attributed to the machine-mashing Luddites, allowing her scheme to go unnoticed. (Her need for the chemical is off-handedly attributed to a planet she rules, where her biological tinkering with the inhabitants has prevented them from sleeping.) The setting, filmed partly on location at the Ironbridge Gorge Museum Trust in Shropshire, plays to the BBC’s talent for clothing extras in period costume, and the sheer number of sartorially accurate people director Sarah Hellings has running around the streets and mineworks of Ironbridge’s preserved Victorian town in the opening minutes sells the reality of the time and place wonderfully, as well as if not better than any of Doctor Who‘s other “historical” stories.
If we’re in Earth’s past and the Master (Anthony Ainley) is involved, then odds remain good that he’s seeking, in Peri’s words, to “pervert history” in order to bend the planet to his will. An assemblage of geniuses, gathering at the behest of George Stephenson, one of the main sparks of the incipient Industrial Revolution, provides the Master with the opportunity to shape the course of events on Earth to create “the platform for the most devastating power in the universe,” answering only to him. The regenerating elephant in the room, the little matter of the Master’s seeming demise in “Planet of Fire,” is brushed past with a quick quip: “I’m indestructible. The whole universe knows that.” And, as ever with the Master, he cannot simply enact his plan, instead drawing the Doctor’s TARDIS off-course so that he might get his revenge on his nemesis as well. As events transpire, revenge may be a dish best served cold, but the Master keeps dropping it on the way to the table.
The Sixth Doctor and Peri thus appear on the scene, with Peri already dressed for a trip to Kew Gardens in the same era, the Master’s efforts changing only the physical, rather than temporal, location of the TARDIS’ landing spot. Before long they intervene in an attack by the Rani’s victims on a cart transporting machinery to George Stephenson (Gawn Grainger). The assailants all have a garish red circular mark on their neck from the Rani’s experiment, the eponymous Mark of the Rani, which draws the Doctor’s interest keenly. They set into town to meet Stephenson, with the Doctor eventually figuring out that the bath house is at the center of it all. So he decides to scruffy himself up and take a dip…