Companion: Jo, Benton, Mike Yates, The Brigadier
Written by: Don Houghton
Directed by: Timothy Combe
Background & Significance: After the rousing success of "Inferno", the Doctor Who production team of Terrence Dicks and Barry Letts asked that story's writer, Don Houghton, to return for the subsequent season to contribute another story to the show. To direct, they brought in Timothy Combe, who had successfully directed "The Silurians" in the previous season.
This result was "The Mind of Evil", the second story of Pertwee's second season. For those keeping score at home, yes, that means we have some Master here. But more interestingly/importantly, it also means we're in the middle of the UNIT heyday. The Doctor is still confined to Earth and, aside from a small stint in low orbit in the previous season and a quick pop over to a parallel Earth (also last season but I hardly think these count), he hasn't even left it in quite a while. It wouldn't be till the next story that he gets limited control of his TARDIS back and the story after that, he's suddenly able to jump off world for the occasional adventure abroad, which wouldn't subside ever, effectively killing the UNIT era, or at least dooming it to a slow and painful death.
If there's one sadness about this story, it's that it only exists in black and white. Then again, I can't complain too much because that gives it the look of a badass, dashing 60s spy movie. Unlike "Ambassadors of Death" (where the black and white is nowhere near as effective), this comes off closer to the first episode of "Invasion of the Dinosaurs", where the black and white creates far more ambiance and soul to the show than anything in colour could have. But it's a nice last hurrah for Houghton and Combe, both of whom never return to the program (the former because he got a better gig working for Hammer films, the latter because he couldn't keep this story to budget in any meaningful way) and one of the first last hurrahs of the UNIT era.
So let's get to it!