The mystery behind Mainframe is finally revealed as he meets the evil Ion Man for the first time…

A-Next faces "The Last Days of the Avengers!" While Stinger and Mainframe are forced into an uneasy alliance against the deadly Iron Man (an all-new super-villain who has ties to a group that will plague our new team), the other Avengers gather around Jarvis to hear his painful memories of the final mission and tragic events that led to the disbanding of the Earth¹s Mightiest Heroes!