Secret Invasion

The old school heroes emerging from the Skrull spacecraft believe themselves to be the real deal. With each side assuming the other is composed of Skrulls, it doesn't take long for a battle to start. Ms. Marvel takes Iron Man away from the site to a local lab, where he starts "using his brain," a power the Skrulls can't copy, presumably to device some form of defense. Meanwhile, the Skrulls invading the rest of the world using their new super soldiers, and only the Young Avengers are around to stand in their way.