Despite winning an Oscar for its visuals in “The Matrix” Manex Entertainment needs a kung-fu fighting superhero to win any chance of working on Warner Bros.’ upcoming sequels for the film. Recent financial woes at the company have prompted Warner Bros. not to award a $30 million contract to Manex’s visual f/x arm, opting instead for ESC Entertainment, a new facility founded by members of the Manex team that worked on the first picture.