Yes, it’s going to be one of those days.
With the recent introduction of the Master, season eight of Doctor Who gathers quite a bit of momentum, as amply illustrated in Don Houghton’s rather frenetic “The Mind of Evil” (Story Production Code FFF). As with Houghton’s last story, “Inferno,” this six episode story splits its action into several disparate threads that all, somehow, tie together in the end, rather hastily in this case. Only another bravura performance from Roger Delgado as the Master, not to mention several classic bits of gurning and general overacting by Jon Pertwee as the Third Doctor, keeps this overstuffed tale on its rails.
The Doctor visits Stangmoor Prison to witness the Keller Machine, a breakthrough in penological science, in action. This device removes the evil thought processes of convicted criminals, rendering them infantile but incapable of harmful behavior. To the discomfort of no one but the Doctor, these thoughts are somehow stored inside the machine itself.
Meanwhile, UNIT has been tasked with securing the World Peace Conference in London, where the Chinese delegation has been complaining of strange break-ins in their quarters. And, just because UNIT doesn’t have enough to do, the task force also must transport Thunderbolt 2, an outlawed nuclear-powered missile, tipped with a nerve gas warhead, to a dock for dumping at sea. Brigadier Lethbridge-Stewart thinks so little of this last assignment that he delegates Captain Yates to lay on a small motorcycle escort for the deadly weapon, because that never fails.
By the end of the first episode, it’s clear that all three situations will come together somehow, but just how remains tantalizingly out of reach. The typical single-minded scientist who will brook no impediment to his plans, as seen in Houghton’s “Inferno” and in Malcolm Hulke’s “Doctor Who and the Silurians,” seems to be the villain du jour, but in this case, our suspect, Professor Kettering, just up and dies, drowning in a dry room, victim to the Keller Machine’s ability to manifest its prey’s deepest fears in order to kill. But then we learn that while the Keller Machine is a danger, it’s not the villain per se. That honor belongs to…the telephone repairman?