One touring production featured John O'Hurley(Family Feud, Dancing With the Stars, Mr. Peterman on Seinfeld) as King Arthur. He also headed up the Vegas cast.
Some who went to the West End production got a chance to witness a singing, dancing FifthDoctor.
The current touring production has Eric Idle as the voice of God.
The Mayor spent some time playing King Arthur in the Broadway production.
In the British touring production King Arthur is usually played by a well-known comedian; recent examples include Sanjeev Bhaskar, Marcus Brigstocke and Phill Jupitus. There is a new Arthur roughly every six months, while the rest of the cast remains largely the same.