Never mind the dratted coffee. What about the spiders?
Though much of Doctor Who‘s eleventh season feels somewhat rote, ticking off the boxes and moving the plots along, never let it be said that the production team skimps on finales. For the Third Doctor’s final story, “Planet of the Spiders” (Story Production Code ZZZ), Robert Sloman, who scripted, in whole or in part, three prior season-ending stories (“The Daemons,” “The Time Monster,” and “The Green Death“) ably assumes the writing duties. While the Doctor’s co-stars here mostly take the form of dodgy arachnoid puppets (and their human puppets), Sloman nevertheless delivers another character-driven piece, focusing on meditation, the Doctor’s greed, and the, ah, transmigration of souls.
The titular arachnoids have conquered the titular planet via exposure to the mind-enhancing Metebelian crystals first introduced in Sloman’s last tale. Though tempting to suggest that the spider’s planet, Metebelis 3 (mentioned as far back as “Carnival of Monsters“), and the blue crystals found there were deliberately planted as plot seeds a year prior, more likely the crystal served as a convenient hook for the story on offer here. (Indeed, the implication that the Doctor was aware of the crystals’ ability to amplify intelligence and thus chose to give one to Jo Grant as a wedding present does not bear contemplation.)
By elaborate narrative happenstance, Jo sends the crystal back from the Amazon, where she and Professor Jones are mushroom hunting, to the Doctor at the very moment that the Metebelian spiders, far in the future, have found a gateway through time and space to contemporary Earth that has been opened by power-hungry novice meditators in a Tibetan lamasery recently opened near UNIT HQ. It’s just one of those coincidences. The Great One, eldest and most powerful of the eight-legs (as they prefer to be called), requires the perfect crystal to complete a powerful crystalline web-circuit that will give her the ability to shape the universe. In his confrontation with the Great One, the Doctor must confront fear, as well as the knowledge that he has brought all of this upon the universe—and upon himself.
(Fair warning: pictures of animatronic spiders, plus a non-animatronic hovercraft, after the break.)