The Mighty Avengers Vol. 1 (2007-2010) #1

Plot

Doom looks like a lady! The super-hero Civil War is over, but Iron Man's work is just beginning. As the new head of S.H.I.E.L.D. and creator of the nationwide Initiative program, he's rebuilding the Avengers with a handpicked roster of Earth's mightiest heroes: Wasp, Black Widow, Wonder Man, Sentry, Ares and new team leader Ms. Marvel. A group this powerful should be ready for just about anything — except, perhaps, the return of genocidal killing machine Ultron. The Avengers' insane robotic foe has rebuilt himself yet again, this time in the form of... a beautiful woman!? NEW AVENGERS writer Brian Bendis and Liberty Meadows creator Frank Cho launch an all-new Avengers series pitting the team against the ultimate femme fatale!

Collecting MIGHTY AVENGERS #1-6.