One of the Avengers' greatest eras has been assembled for this Omnibus collection! It's cover-to-cover in watershed moments: the first appearances of Ultron and the Vision; the Black Widow's surprise connection with the Red Guardian; the Avengers vs. the Super-Adaptoid; Quicksilver and the Scarlet Witch defect; the Black Panther joins the team; the Avengers fight the X-Men; the first-ever full telling of Bucky Barnes' tragic death and much more. Collecting: Avengers (1963) 31-58, Annual (1967) 1-2, X-Men (1963) 45, Not Brand Echh (1967) 5, 8