Can you find out that Kermit the Forg debuted in 1978 on Sesame Street?
The Wonderful World of T-Shirts sketch didn't debut in Season 11 or Season 12 on Sesame Street! It debuted in 1978 and it's a 1978 sketch! It may have debuted in Season 9 or Season 10! So can you complete all of the episode guides of Sesame Street Seasons 9 and 10 and see if has got the Wonderful World of T-Shirts?