In a funny way, he reminds me of a sort of younger you.
Sometimes in Doctor Who, the monsters and their villanous plans represent the main event, no matter how assiduously the actors pursue their craft. In Robert Sloman’s “The Green Death” (Story Production Code TTT), the malevolent miscreants (giant maggots and a crazed computer, in this case) and their associated hijinks are very much put to shame by the power of the actual story, that of the Doctor realizing he is losing a companion, and the strength with which Jon Pertwee and Katy Manning carry off the six episode farewell.
And it’s just as well the Doctor’s impending heartbreak sustains “The Green Death,” since the ostensible story itself makes no sense at all. In quick summation: a corporation secretly run by a megalomaniacal, self-aware computer has discovered a process to extract more gasoline from petroleum, but the byproduct, which is being pumped into an abandoned Welsh coal mine, causes ordinary maggots to turn into giant versions whose bite causes all human cells to decay (and turn a bioluminescent green), to say nothing of the giant flying creatures into which they eventually metamorphose.
Yet the maggots, it turns out, have absolutely nothing whatsoever to do with the computer’s plan; they’re simply an unforeseen side-effect of a refining process so powerful (and profitable) that the U.K. Prime Minister orders UNIT to help the corporation, Global Chemicals, hide evidence of the creepy-crawlies by destroying the mine entrances. Perhaps years of Yeti and other invasions have made giant insect infestations sufficiently run-of-the-mill that no one notices or much cares anymore.
The crazed computer’s real goal is to turn all humans on the planet into efficient robotized creatures using a form of mind control inflicted via souped-up stereo headphones, a revelation that comes pretty much out of nowhere after several episodes being devoted almost entirely to the mine and its unwelcome inhabitants. It’s another story altogether shoehorned into what could have been a strong, tightly-focused commentary on the lengths humanity is willing to go for cheap, abundant energy—throw another gallon in the tank, and never mind the maggots.
Luckily, we get to see Jo fall in love over several episodes, and in truth, that makes all the parlous plotting and half-baked stories worthwhile.