The Avengers Vol. 1 (1963-1996) #163

Plot

Guest-starring the Champions. Over the skies of New York City, Iron Man attacks the Champions! What has possessed the golden avenger to ambush his fellow super-heroes? That's what the Black Widow, Iceman, and Hercules would like to know! Shell-head make short work of the widow and Iceman, but the Lion of Olympus is a completely different matter! Iron Man and Hercules wage a fierce battle in the streets of Manhattan from Columbus Circle to Avengers Mansion! And inside the mansion...the true villain awaits! (mycomicshop.com)