In the Cat's Playhouse, Terrence has a nasty case of the hiccups...what to do? In the Wubbulous World, Sarah Hall-Small has a hard time choosing what instrument she wants to play in the Seussville band. And when Horton and Morton go exploring in the jungle, Morton learns that scary sounds aren't always scary things.

In the Cat's Playhouse, Terrence tries to fly for the first time, and does. But he's scared to try again. In the Wubbulous World, Morton sleeps over at Junior Kangaroo's house for the first time, and it's very different from his house. And Sarah Hall-Small, after buttoning her sweater for the first time, imagines all the other "firsts" she'll have.

In the Cat's Playhouse, the cat and Little Cats are building a Door-A-Matic, a contraption that will open the door, but Terrence is skeptical. In the Wubbulous World, Matthew Katroom finds a stick and imagines all the things it can be. Also, Junior Kangaroo builds a sand castle and imagines what it would be like to live inside it.