The family drives up to the Natural History Museum. Calvin sees the stegosaurus in front. Calvin can't wait to see the dinosaurs and rushes from the car. Mom says it's been a while since they were at the museum. Dad mentions that was at the museum's request. That reminds Mom, who tells Calvin not to bite anyone this time. Calvin is already roaring like a dinosaur.

Mom asks Calvin what kind of dinosaur they're in front of. Calvin tells her it's a stegosaurus. Mom says it looks ferocious, but Calvin tells her it was a plant eater. He tells her the tail spikes were for self-defense. Mom then asks if tyrannosaurs fought them. Calvin tells her of course not. Tyrannosaurs came millions of years later. Calvin walks to the building telling her not to embarrass him when they go inside. Dad wonders why they're going in if he knows everything already.

Calvin shows Hobbes a saber-toothed tiger. Calvin makes fun of it by saying anyone needing a can of juice opened would just put him over it and hit his head. Calvin continues by saying they probably died out because they couldn't understand each other. He makes a face and shows his teeth. Hobbes grabs Calvin by the shirt and frowns at him. Calvin quickly points out that all in all, they were the pinnacle of prehistoric evolution.

Calvin points out the museum gift shop to Mom. He wants to buy something, a poster, a book, t-shirts, models. Mom says she doesn't think he needs any more dinosaur stuff. Calvin says it's all educational. Doesn't she want him to learn? Calvin, walks with his dinosaur hat, poster, and book. Hobbes says she sure fell for that one. Calvin wonders if he can get any Batman junk that way.