Joe and Blue are creating an alphabet train, with the help of their friends. There are going to be boxes from A to Z connected to the train and each one will contain something to represent that letter. Joe and Blue help the characters throughout to figure out what they can put it the boxes and also help to make sure everything is in order. The skidoo trip takes them into a magnet board, where they find every more things for the boxes. Once the train was complete, they join in a song about the alphabet and objects.
Due to I'll Never Forget My Alphabet at the end of the episode, there's no time left to sing the So Long Song.
In 100th Episode Celebration, a clip of it was seen in The songs we've sung before this aired & was then in the sneak peek.
Joe takes the Yo-Yo with him when he skidooed back home. There was another episode titled Blue's Big Holiday where Steve took 3 things from the skidoo segment. Also in Mailbox's Birthday, Math!, and Blue's Birthday (the three episodes where Steve and Blue skidooed to the present store - in the third mentioned, it was just Steve), the bought products were brought out of the skidoo.