David can’t wait to spend another summer at his grandmother’s Intergalactic Bed & Breakfast — a vacation hot spot for aliens. But this summer isn’t quite what he was expecting. There are some new faces at the B&B this year, including a doglike purple creature named Snarffle, who appears in David’s room out of nowhere, and Scratchull, Grandma’s new alien repairman. With David’s friend Amy running everything at the B&B, and Grandma busy preparing to win the baking competition at the town’s Pioneer Day Festival, David feels like he doesn’t fit in. To make matters worse, David thinks that Scratchull is an evil mastermind with a plot to destroy Earth, and no one — not even Grandma — believes him.