Chris Rock
From Muppet Wiki
Chris Rock (b. 1965) is an actor and comedian.
He makes a brief appearance in Elmopalooza, offering to host the show when Jon Stewart becomes locked in his dressing room. He's all set to start when Prairie Dawn tells him he can't do any dirty jokes. As he's leaving, he tells Oscar that the audience would have loved his mud jokes.
Rock was also heard as Rodney in the Creature Shop feature film Dr. Dolittle.
