Episode 3951

An Alphabet Explorer appears on the Street, and recruits Elmo, Telly and Zoe to help him catch the Dotted Dinging D. Along the way, they find the Dancing Drumming D, and the Dotted Driving D.

Segments

 * Harvey Kneeslapper holds a cookie, and asks his next victim if he wants one. It's better to just say no.
 * Elmo's World: Teeth