Collects Avengers (1963) #51-58 and Annual #2, X-Men (1963) #45. Take a trip through one of the most stellar creative periods in Avengers' history! The Black Panther joins the team, the Avengers fight the X-Men, a new Masters of Evil debuts, the story of Bucky Barnes' tragic death is told in full for the first time, the new Avengers and the original Avengers face off in a reality-bending battle — and don't forget the first appearance of Ultron! Plus, one of the most famous stories in all of Marveldom: the Vision's debut in "Even an Android Can Cry."