Sir Peter Alexander Ustinov, CBE was an English actor, writer, filmmaker and dramatist who voiced Prince John and King Richard in Robin Hood (where he also voiced only the former in German) and also played the title character in Blackbeard's Ghost, Dr. Snodgrass in Treasure of Matecumbe, and Hnup Wan in One of Our Dinosaurs is Missing. He was offered the role as Chairmouse in The Rescuers but downed down the role.

He also guest-starred on The Muppet Show in episode 112 and made a cameo appearance in The Great Muppet Caper.