Don Messick

Don Messick voiced Chu Chu in the series. He voiced characters in nearly every Hanna-Barbera series. He was best known as the voice of Scooby-Doo and later voiced his nephew Scrappy Doo. Other notable characters are Boo-Boo and Ranger Smith, So-So the monkey, Ricochet Rabbit, Astro, Muttley, Mumbly (no relation) Dr. Benton Quest and Bandit, Papa Smurf and Azrael, and Sebastian and Bleep from Josie and the Pussycats. Don worked with Paul Winchell In Dastardly and Muttley In Their Flying Machines, where they were the only two voice actors in the series. Not only he voiced Muttley, he also voiced Klunk, Zilly and Yankee Doodle Pigeon.