Class 3A Trip to the Natural History Museum

The class 3A trip to the Natural History Museum is turning out to be a disaster: Many of Katie's excited classmates are acting up, and they turn on Katie and call her a goodie-goodie when she won't join in!

Even worse, their tour guide, Mr. Weir, is a big meanie!

Still, when Katie turns into Mr. Weir and causes a big disaster of her own, it's up to her to make things right—and save Mr. Weir's job!