Leo's family reunions are the worst-boring food and old stories. But this year, his quirky great-aunt Mabel lets it slip that the family isn't just from the Midwest; they're from the Andromeda Galaxy. Now, Leo must help his mom (who is trying her best to be a "normal human parent") navigate a family reunion filled with uninvited alien relatives, intergalactic potluck disasters, and a cousin who won't stop shape-shifting into the family dog.