Collects Uncanny X-Men (1963) #199-209, X-Men Annual (1970) #10.

Change is in the air for the X-Men as Rachel Summers lays claim to the Phoenix Force, Magneto stands trial and joins the team, Professor X departs for outer space, and Cyclops becomes a father! And that's just the start of the team's adventures, as the Beyonder erases the New Mutants from history, the futuristic Nimrod Sentinel attacks, and Mojo regresses the team to childhood! Plus: A pair of bonafide X-Men classics, as Storm duels Cyclops for team leadership, and Lady Deathstrike hunts Wolverine in a savage tale by Barry Windsor-Smith!