When Polly and pals find out they are too short to ride the new Whopper Whirler, Polly recreates a miniature of the coaster. But a faulty screw causes the coaster to break. Now, they must fix the real rollercoaster before it breaks too!

Polly's babysitter, Ms. Mense, won't let her outside until her homework is done. So, Polly sneaks out of the house to help Lila with her new dog walking business. Now, she must get back in her room without getting caught before her parents get home!