Warner Bros. held the world premiere of its new "Superman" film in Hollywood on Monday night. British actor Nicholas Hoult, who plays the Man of Steel’s nemesis Lex Luthor, appeared on the red carpet alongside cast members and studio executives, highlighting the start of the movie’s global publicity campaign. The Los Angeles event marks the first public screening ahead of the film’s wider theatrical release later this month. Industry watchers will track early critical reaction and fan buzz from the premiere as indicators of box-office prospects for the latest reboot of the DC franchise.