Astro City is a shining metropolis on a hill where super-heroes patrol the skies. However, things were not always as bright as they are today. In the early 1970's, in the wake of a global catastrophe, two brothers, one good and one evil must deal with family secrets and social upheaval, involving heroes from Jack-In-the-Box to the Blue Knight and the unsettling events leading to the final fate of the mysterious Silver Agent.