Kunis let it slip that the cast had, in fact, already done a table read for the Empire themed episode. It is definitely moving into production, and the script has been completed.
Seth MacFarlane also stated that the Empire episode was a lock, and that they had already done the table read. He also stated that Giant Chicken would be playing Boba Fett.
What about Return of the Jedi? MacFarlane says that if Empire proves to be as popular as Star Wars, they will definitely finish the trilogy Family Guy style.
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