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Chewbacca is a Wookiee , a character in the Star Wars universe. He is Han Solo 's friend and co-pilot. Chewbacca became Han Solo 's co-pilot and friend after Solo, then an Imperial Captain, refused an order to kill him while Chewbacca was a slave of the Empire. Solo was dismissed from the Imperial Navy for disobedience and became a smuggler. Chewbacca owed a life debt to Han and would serve Han Solo for the rest of his life.