Chewbacca, a 200-year-old Wookiee, becomes Han Solo's companion after Han, then an Imperial officer, refused an order to kill him, for which Han was dismissed from the Imperial Navy and became a smuggler.
Chewbacca becomes Han Solo's companion. Han refused an order to kill him. This was for which Han was dismissed from the Imperial Navy. Chewbacca became a smuggler. Han is then an Imperial officer. Chewbacca is a 200-year-old Wookiee.