You’ll run out of doctors in a minute.
So, we have an underground base? Check. An unexplained device capable of creating natural disasters anywhere on the planet? Check. Monsters attacking said base to use the technology to their own ends? Um, no? Turns out, despite most of the trappings, David Whitaker’s “The Enemy of the World” (Story Production Code PP) changes everything up, and just in time. No monsters (of the non-human variety, at least), no base under siege, just a careful (and rousing) exploration of the importance of trust and certainty, played out through the device of the Doctor’s double. Or, rather, the Doctor being a double. Everyone winds up confused, and that’s a very positive development for Doctor Who as a series.
We’ve covered this ground before, at least marginally, in the superlative “The Massacre of St. Bartholomew’s Eve,” wherein the Abbot of Amboise matches the First Doctor to a tee. But there, the arch coincidence remains mostly that, a coincidence that allows William Hartnell to stretch his acting chops somewhat by playing a new role; the story doesn’t make much of the similarity. Here, the Second Doctor is found to look exactly like Salamander, a highly influential philanthropist and inventor who supplies many of the Earth’s food needs by directing stored solar energy to areas lacking sufficient sunlight to grow abundant crops. However, when the Doctor is spotted cavorting on a beach just after landing—he does love the seashore—he, Jamie, and Victoria are set upon by men trying to kill him, thinking him to be Salamander, apparent benefactor of all humanity. With a hovercraft. It is the future, you see, just shy of the year 2019. Hovercraft it is.