Brit is an aging superhero whose invulnerability makes him the United States government's last line of defense. For decades, he has faced the most dangerous threats, from superpowered criminals to alien invasions, often relying on brutal methods. But behind his reputation as an indestructible fighter, Brit is also trying to build a family life with Jessica and their son. As his relationship with his superiors becomes increasingly complicated and new catastrophes threaten Earth, he must balance his personal responsibilities with missions assigned by an organization that sees him primarily as a weapon.