Kurt Busiek and George Perez continue their defining run! When you're an Avenger, you're one of Earth's Mightiest Heroes - the first line of defense against the dangers no conventional foe could halt. Threats including the Thunderbolts, Dominex, Lord Templar, Pagan and the Wrecking Crew! But not even the Avengers could prepare for a gruesome discovery in Slorenia: Every man, woman and child dead, eliminated with the cold precision of a machine. And out of the flaming remants of this tiny Baltic state comes a message from its murderer: Ultron has returned! Never before has he been this deadly, as he stands on the brink of committing global genocide and rebuilding earth in his own robotic image. Our only hope is a desperate strike on Slorenia led by the Avengers. But will it be in time? Collecting AVENGERS (1998) #12-23, #0 and ANNUAL '99; and AVENGERS (1998) #1 ROUGH CUT.