An evil goblin king, played by David Bowie, pictured here, a talking door knocker, fairies and a colony of goblins will join producer/director Brian Henson and members of the Jim Henson Creature Shop at the Academy of Motion Picture Arts and SciencesÕ 20th anniversary screening and onstage discussion of ÒLabyrinthÓ (1986) on Thursday, July 20, at 8 p.m. at the Samuel Goldwyn Theater in Beverly Hills.