From StarWars.com:
Two of the unseen faces who portrayed Boba Fett in the original trilogy will be at Celebration V; Dickey Beers, who performed the stunts for not only Fett, but Luke as well, during the Sarlacc pit scenes, will make a first-time Celebration appearance, along with Jeremy Bulloch, who played not only Boba Fett, but also Lieutenant Sheckil (The Empire Strikes Back) and Captain Colton (Revenge of the Sith).


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