When most people think of the Grinch, their minds go straight to Christmas; after all, 1966’s How the Grinch Stole Christmas has become a holiday classic, airing year after year with Boris Karloff‘s unforgettable narration. However, tucked away in television history is another Grinch special: a darker, grimmer prequel called Halloween Is Grinch Night. Airing on ABC on October 28, 1977, and is often considered a prequel of sorts to the Christmas classic.