It’s a cult show that could’ve hit the zeitgeist if it had just happened a few years later. From angsty vampire-human romances to a butt-kicking lead in a nice dress, the first season of “Buffy the Vampire Slayer” delivers. We break down our favorite episodes, marvel at the show’s great casting, and appreciate the unlikely nature of a smart, character-driven teen series emerging from the wasteland that was The WB network in the late ’90s....