In this episode of Sesame Street, Big Bird starts the day by singing a welcoming song and is soon joined by 19 friends. Ernie tries to replicate Bert's felt board picture, but Cookie Monster disrupts his efforts by eating the cookies off both pictures. The Countess Dahling von Dahling visits Hooper's Store, delighting everyone with her counting skills and gifts of umbrellas, which come in handy when it starts raining indoors. Cowboy X arrives on Sesame Street, marking everything with Xs, and learns about the alphabet and words containing the letter X from Big Bird, Luis, and Mr. Hooper. Various segments include Ernie and Bert's telephone antics, a Sesame Street News Flash with Prince Charming, and a musical number by Herry Monster. The episode concludes with Cowboy X giving Big Bird his autograph and Oscar the Grouch attempting to end the show with a grouchy goodbye song, only to be interrupted by Bob re-announcing the sponsors.