It's Mouse's first day of school, and she is so nervous. She can't eat her cereal, and she wonders what the children will be like. And it's Dinosaur's first day of school, too! He is so nervous that he can't eat his toast. He is afraid that the teacher won't like him. And the school looks so scary! But when Mouse and Dinosaur arrive at school, they're both in for a big, happy surprise!