Frank Oz provided Yoda's voice in each film and performed as lead puppeteer in the original trilogy, ' and ', as well as appearing for a vocal cameo in "". For some walking scenes in "The Empire Strikes Back" and "The Phantom Menace", dwarf actors Deep Roy and Warwick Davis appeared in costume as Yoda (though neither was credited). While Frank Oz served as the primary performer, over the years he had been assisted by a multitude of other puppeteers, including: Kathryn Mullen ("Ep. V"), Wendy Froud ("Ep. V"), David Barclay ("Ep. V"-"VI"), Mike Quinn ("Ep. VI"), David Greenaway ("Ep. I" & "VI"), Don Austen ("Ep. I"), Kathy Smee ("Ep. I"), Dave Chapman ("Ep. VIII"), Damian Farrell ("Ep. VIII"), and Colin Purves ("Ep. VIII"). For the radio dramatizations of "The Empire Strikes Back" and "Return of the Jedi", Yoda was voiced by John Lithgow while Tom Kane voiced him in the and several video games.