The Mighty Avengers, Vol. 1: The Ultron Initiative - The wait is over!! The Mighty Avengers assemble!! Gathered together to be the greatest Avengers team ever, but who picked them and why?! And which A-list Avengers villain returns, revamped and reloaded for the ultimate revenge? Big superhero adventures from the multi-award winning team of Bendis and Cho. Mighty Avengers (2007) #1-6.