Gabi and Miles are graduating from High School. They remember their very first day of school and tell Elmo how they remember their classroom being an amazing place.
Today is Luis and Maria's wedding anniversary. They have decided to celebrate by having a picnic together. Little do they know, though, that it is "H" day on Sesame Street.
Telly is the host of the "Ask Oscar!" show and he reads a letter from a boy who can't remember what the little round things are on a jacket. Oscar isn't helping, but Telly is determined, so he enlists the help of his friends on Sesame Street.
Baby Bear and Telly decide to use their imaginations to write a story together, but have a hard time deciding on whether their story should be about a magic bowl of porridge or a magic triangle. Celebrity guest Chuck Close.
On a very busy day at Hooper's Store, Baby Bear decides to create a lemonade pouring machine to help Miles out. He draws up the plans for his invention and then recruits Telly and Elmo to help build it.
When Slimey says that he wants to be a hero just like Trash Gordon, Rosita and Elmo are doubtful because they think heroes are supposed to be big and strong. But Oscar reassures him that he can do it, and Slimey takes on the mission of saving the letter of the day.
There's a lot of excitement on Sesame Street because Gina is adopting a baby! After a lot of planning, today is the day that Gina is flying to Guatemala to pick up her baby, Marco, and bring him home.
Snuffy and Big Bird want to play with their new friend Marco, Gina's baby. Gina suggests that they think like babies to come up with games that everyone can play together.
