Mr. Hooper asks Big Bird to open up the store for him while he runs an errand. Big Bird is more than glad to, but it proves not to be as easy as he thought. Sesame Street is brought to you today by the letters L and O and by the number 3. Also happening today: Bob introduces the OP family, Ernie writes a dramatic, alphabetical story, Grover and Herbert Birdsfoot demonstrate under and over, Little Bird talks about imagination, and the classic hit "Mahna Mahna" is performed.
—Shanak41