Sci-fi shows that were too geeky to ever air

Science fiction is permissive of some pretty weird stuff, embracing aliens with buttcrack heads as readily as it does surrealist visions of both Utopian and apocalyptic societies. So what does it take to make a sci-fi TV show so strange that it never even airs? Tons of unaired pilots linger in vaults all over the world, too weird to ever make it to your screen. Here are some of the unreleased classics that we actually know a little about.