 In this "Star Wars" sequel, the battle to save the galaxy from the evil Darth Vader rages on. Han Solo, Princess Leia and Chewbacca are tested in a devastating attack by the Imperial army and its AT-AT Walkers. Meanwhile, Luke Skywalker (seeks out the ancient Yoda to learn the secrets of the Jedi . . . secrets Luke will need when the Dark Side of the Force beckons him in a destiny-defining duel with Darth Vader.