Simon Williamson is an actor and puppeteer who performed UrSol, the Mystic chanter in The Dark Crystal and served as an additional puppeteer on The Muppet Christmas Carol. Williamson's other credits include multiple alien roles in Return of the Jedi, notably bandleader Max Rebo, and assisting on Audrey II in Frank Oz's feature Little Shop of Horrors.
- The Great Muppet Caper: Additional Muppet Performer
- The Dark Crystal: Mystic Chanter, Garthim; right-hand for Skeksis Gourmand
- The Muppet Christmas Carol: Additional Muppet Performer
- Muppet Treasure Island: Additional Muppet Performer