Henry and his dog Mudge are invited to a sleepover in Patrick's attic, where they watch monster movies, eat pizza, and enjoy a contest to determine whose dog is the best popcorn catcher.
Best friends Randolph, a beaver, and Ivy, a goose, do everything together until Ivy is invited to a girls-only birthday sleepover party and Randolph, full of bad feelings, tries to spoil her fun.
Emily says "Yuck" whenever apples are mentioned, but when she and her older brother, Harry, sleep over at their grandparents' house, they all pick apples and make them into delicious pies.