Sturgeon wrote the screenplays for the "" episodes "Shore Leave" (1966) and "Amok Time" (1967, later published as a "Fotonovel" in 1978). The latter is known for his invention of the pon farr, the Vulcan mating ritual, the first use of the sentence "Live long and prosper" and the first use of the Vulcan hand symbol. Sturgeon also wrote several episodes of "" that were never produced. One of these was notable for having first introduced the Prime Directive. He also wrote an episode of the Saturday morning show "Land of the Lost", "The Pylon Express", in 1975. Two of Sturgeon's stories were adapted for The New Twilight Zone. One, "A Saucer of Loneliness", was broadcast in 1986 and was dedicated to his memory. Another short story, "Yesterday was Monday", was the inspiration for The New Twilight Zone episode A Matter of Minutes. His 1944 novella "Killdozer!" was the inspiration for the 1970s made-for-TV movie, Marvel comic book, and alternative rock band of the same name.