Episode: “Catspaw”, in which Kirk, Spock, and Bones visit a sort of haunted house planet where Scotty and Sulu have gone missing. Robert Bloch is one of the biggies of horror, but his script is basically a muddled excuse to pitch a bunch of spooky nuggets at the viewer. There are three hideous floating witch heads, a giant black cat, a misty old Gothic castle, dungeons, skeletons, curses, a sorceress and sorcerer, mist, and lots of references to Halloween (the episode aired just a few days before October 31, 1967). The denouement, which involves a couple of tiny space lobsters, wins points for total weirdness. Spock’s blasé reaction to those terrifying witch heads is comedy gold. So is Chekov’s wig.