I am by far not a SW geek, but I thought Frank Oz did ther voice of Yoda every time. But a niece of mine said John Lithgow did it too. I don't like him , so just to be pro Oz, I told her she was wrong..................... I really don't know. BUT at first I didn't care, but now I am kind of interested, somone invade their next door basement, drag out thier 35 year old, unmaried son, with a masters digree in Fine Arts and ask him for me..............