Crossing (Comic Book Industry Events and Awards)

Iron Man is revealed to have been working for Kang for years. Mantis sides with Kang out of heartbroken spite. There's a mysterious time portal in the Mansion's basement, a couple of murders and more confusion than you could shake an enigma AND a riddle at!

The Avengers travel back in time to enlist a 19 year-old Tony Stark while his grown-up version almost kills them. The older Stark ultimately makes a heroic self-sacrifice, allowing Teen Tony to remain in the present, becoming Iron Man until the subsequent Onslaught incident, wherein a great many heroes seemingly died.

Instead, Franklin Richards saves the heroes and recreates the adult Tony on his Counter-Earth - thereby making The Crossing more or less obsolete. Kurt Busiek later gives it a more considerable retcon (see Notes). Overall, the story didn't really make much sense. We see Tony to be the traitor from the very beginning but whenever we read his thoughts, he doesn't seem to be aware of his own misdeeds. However, when his crimes are later revealed to the Avengers, Tony isn't surprised at all - making it somewhat doubtful that he was completely mind-controlled...

Source:

http://marvel.wikia.com/wiki/The_Crossing