Collects issues #48-53!
Up until this point, Invincible has been working for the Global Defense agency. Fighting their fights, defeating their enemies... now something's not right, Invincible can no longer carry out his orders unquestioned. Now he finds himself up against the very organization he's been working for!
Mark Grayson is teenage superhero Invincible. He was a normal high school senior with a normal part-time job and otherwise normal life, except his father Nolan is the superhero Omni-Man, the most powerful superhero on the planet. At the age of 17, Mark begins to display superpowers, which come from his father being a member of the Viltrumite race, who, according to Nolan, pioneer the galaxy on a mission of benevolence and enlightenment. As Invincible, Mark begins working as a superhero, with his father acting as his mentor, and meeting other heroes. Then, superheroes around the world begin to die.