Braid Beard and his pirate crew return to retrieve the treasure they buried in Jeremy Jacob's backyard, but first they must help calm his baby sister, Bonney Anne, whom they awoke from her nap.

When Art and his friends-Robbie, Jason, and Amy-are having a sleepover, they decide to use Art's telescope for some stargazing. They are shocked to see a purple spaceship hurtling toward Earth. While his parents think his imagination is getting the best of him, Art thinks Earth is at risk of an alien invasion. What should he do? Should Art and his fellow science detectives alert the authorities, or should they take matters into their own hands? When...