Mighty Avengers, Vol. 1 #2 (2007)

The Initiative - The Mighty Avengers
Moments ago, the new Mighty Avengers were testing their mettle in a first battle with the Mole Man. But in the heat of battle, Tony's armor is transformed into a silvery woman, with an eerie resemblence to Wasp. As every attempt to stop her meets with failure, Janet van Dyne attempts to speak to her, leading to a revelation that one of the Avengers oldest foes has returned again to plague them.
Release Date: 2007