After Morty, Summer, and Jerry inadvertently wind up in the Revolution World, they are quickly confronted by Revolution Summer and her band of rebels. There they are presented with an ultimatum: join the cause or suffer the consequences! Meanwhile, underneath the watchful glass eye of Revolution Morty, Rick and Beth must survive a death run into the heart of the Urban World, where they'll unlock the key to this whole stupid rebellion...and discover a squishy, bulging horror that threatens the very brains of our heroes!