The Big Cloud Mall kidnaps Auntie First, the Flatulent Swamp and Under after its Belch-Bean Cookoff in order to keep its engine (which runs on bad smells) running. Russell and friends head to the Mall to save Under but are slowed down by security. Fortunately Bob, seeing them on the Mall, realizes Under is going to be saved either way, and decides to do it himself and earn their undying gratitude.