X



X is a letter of the English alphabet. Used in various Sesame Street sketches as a prop or concept, the Letter X has also appeared as a Muppet character on various occasions, such as being serenaded by Patti Labelle or as a mystery guest on a Guy Smiley game show.

The letter X has sponsored the following episodes of Sesame Street:
 * Episode 0008
 * Episode 0560