Rick and Beth have infiltrated the Revolution World with a less-than-foolproof plan to destroy the rebellion from the inside out, but that plan is quickly thwarted by dinosaur-riding rebel children out for Rick's blood. Meanwhile, back home, Summer discovers Rick's pocket universe, along with evidence that Rick and Beth are there. Worse, she learns this universe is becoming unstable, and it's only a matter of time before it collapses on itself . . .