Usually even-tempered, Mr. Chatterly's intellectual discussions of letters are often interrupted by animals, people or production staff wandering onto the set. This infuriates Chatterly, who wonders why he can't have a sensible show.
In Episode 3256, he comes to Sesame Street to arrange an Alphabet Chat on the letter P. In the episode, he reveals his name to be A. B. Chatterly.
His name is a reference to the D.H. Lawrence novel Lady Chatterly's Lover.