Ms. Frizzle and her class are trying to come up with a birthday present for Dorothy Ann. A TV salesman seems to have the perfect idea -- the kids can buy a star from him and name it after Dorothy Ann. But Keesha doesn't want to buy anything sight unseen. So, Ms. Frizzle rockets the class off on a field trip to outer space. Join the class as they do some careful star shopping and gain a lot of star knowledge along the way.