Source: gamespot.comicvine.com

14. Iron Man (Tony Stark) (The 19-Year-Old One)

(aka Iron Boy)

Ah, Tony Stark, our favorite recovering alcoholic jerk.

Well, during the Avengers story known as The Crossing (different from The Crossing Line, which was that one time someone let Stingray be an Avenger), Immortus manipulated Iron Man into becoming a crazy evil psycho jerk and betraying the Avengers. The Avengers in turn decided to go back in time and grab a past version of Tony to come back with them and fight the present one. However, they crossed over into an alternate dimension by accident, and grabbed that reality’s Tony Stark, a 19-year-old kid. He got himself a new armor, and became known as Iron Boy.

Iron Boy became an Avenger, and tried to fight his evil duplicate, but he was hopelessly outclassed. Not only did Iron Man beat him, he punched a hole straight through the kid’s chest. However, said Mortal Kombat-ing made old Tony realize what a jerk he’d become, so he sacrificed himself to beat Immortus, and gave the Avengers the technology they needed to save Iron Boy’s life. Iron Boy lasted with the team until Onslaught killed him (and the rest of the Avengers).

However, instead of being reborn on Counter-Earth with the other Avengers, someone decided to bring back the Tony Stark version who could legally rent a car. We never heard from Iron Boy again.