 Joseph Zito, who had directed Cannon's successful Chuck Norris film "Invasion USA", replaced Tobe Hooper.The new director hired Barney Cohen to rewrite the script.Cohen, creator of TV's "Sabrina the Teenage Witch" and "Forever Knight", added action scenes, a non-canonical comic-book sidekick for the villain, gave Doc Ock the catch phrase, "Okey-dokey", and altered his goal from the Fifth Force to a quest for anti-gravity.