Thrawn Revealed in Star Wars Rebels Season 3 Trailer Straight from Star Wars Celebration comes the Star Wars Rebels Season 3 trailer! It’s revealed in the new trailer that none other than Grand Admiral Thrawn will be making his debut in the series. The fan-favorite character from the Star Wars Legends books will be voiced by Lars Mikkelsen (brother of Rogue One: A Star Wars Story star Mads Mikkelsen).