For Halloween, Syfy is presenting all the “Freddy” movies, otherwise known as the Nightmare on Elm Street franchise, in a spooky marathon beginning at 11 a.m., and running into the night. The marathon begins with writer-director Wes Craven’s original 1984 thriller, in which Freddy Krueger, played by Robert Englund with an increasingly malevolent glee, terrorizes several people as they sleep, invading their dreams and, in many cases, scaring them to death. Among Freddy’s intended victims in this first film: a good-looking kid, played by a very young actor named Johnny Depp.