When Pickles the elephant turns his life upside-down, Pete the pig comes to realize that a perfectly predictable, practical, and uncomplicated life is not always preferable.

Take out the trash, eat your broccoli. Who needs moms, anyway? Nine-year-old Milo finds out just how much he needs his mom when she's nabbed by Martians, who plan to steal her mom-ness for their own young. Milo's quest to save his mom involves stowing away on a spaceship, navigating an elaborate, multi-level planet, and taking on the alien nation and their leader.