 The two held story conferences until early December, and Brackett wrote her draft while McQuarrie began to paint concept art.Lucas and Brackett discussed including the planet of the Wookiees (which had been considered for the first film), a new alien species, and two new characters—the Emperor and a gambler from Han Solo's past.Lucas also decided early on that they needed to introduce a new teacher for Luke, since Obi-Wan had been killed off in the first film.