John Stewart's time as a Green Lantern has come to an end... or so he thinks. A family tragedy calls him back home, and as John begins to reclaim the career he once left behind, he tries to embrace a peaceful post-superhero life. But when a terrifying and contagious force with a mysterious connection to Oa appears on Earth, the last Green Lantern of another Universe comes seeking the only warrior to face this threat and win: the immortal "Guardian and Builder," John Stewart himself! Can this brilliant but brash young Lantern help John discover the qualities that made him one of the greatest Lanterns of the entire Multiverse? Featuring the first appearance of an iconic and terrifying new villain!