Star Wars: Galactic Civil War prologue

Set between Episodes IV and V. The Death Star has been destroyed, but it's not over. Whilst fighting a frigid crystal world, Luke meets a someone who fought alongside his father and wishes to help him in his training. Encountering enemies and allies old and new, our heroes will face a Gen'dai mercenary, a deadly new Sith assassin, a cyborg general, and Darth Vader.