Our heroes and their foes have traveled through space and time, finally arriving at a distant planet on the edge of the universe. As Rick, Nunzumel, and the Goldenfolds fight over who can claim the planet and its abandoned space milkshake stand like a bunch of settlers, Morty and Noelle concoct a secret plan to leave those squares behind. But this long-dormant planet holds secrets of its own—slimy, stupid secrets!