One of those Doctor Who stories that everyone over 35 knows about (the one with the giant maggots), The Green Death is a solid example of Jon Pertwee's tenure as the Time Lord, during what many consider to be the series' Golden Age.
Called out to a Welsh mining town plagued by mysterious deaths, the Doctor discovers toxic waste, a world domination plot and monster larvae. Not to mention brainwashing and a megalomaniacal computer. While the maggots look like the inflated condoms they are and there are some appalling bluescreen scenes, the story's solid, with Pertwee at his regal best.