Iron Man was typically treated as a b-rated hero before Robert Downey, Jr. made this character the icon of a generation, so when did the change begin? Remso and Marc cover the Invincible Iron Man “Extremis” storyline (issues 1 through 6) from legendary comic book writer Warren Ellis, which not only updated Tony Stark’s origin, but propelled the armored avenger from being just another superhero to being the focal point of the Marvel Universe.