The latest and greatest roster of Avengers head down the rabbit hole to find out who is behind the all-new H.A.M.M.E.R. in your first look at Avengers #20! Just when the world thought it was safe, Norman Osborn has recruited a powerhouse team of new Dark Avengers and he's out for revenge. Combined with the might of the former leaders of H.Y.D.R.A. and A.I.M., the Avengers will need serious firepower to tackle this threat. Luckily, that's where their new recruits come in. Get in on the action, courtesy of the red-hot creative team of Brian Michael Bendis and Daniel AcuÃ±a this December, in Avengers #20!