Ever since fans were introduced to the patrons of the Mos Eisley cantina, Star Wars has been known for its vast array of alien species. Twi'leks are among the most recognizable of these species, although they did not appear on-screen until Star Wars: Return of the Jedi, and the name Twi'lek was not used until the Star Wars Sourcebook, published in 1987 by West End Games.