The Uncanny X-Men
Archangel investigates a crime scene where mutants apparently killed humans. Wolverine confides in Storm that his humanity is slipping away. Juggernaut falls from the sky, disoriented and terrified of someone called Onslaught.
Return to the prime timeline — aftermath of the Age of Apocalypse
Collects X-Men #42-45, The Uncanny X-Men #322-326, X-Men Prime, X-Men '95 #1, X-Men Unlimited #8. The Road to Onslaught -- Professor X's dark side emerges post-AoA.
Collects The Uncanny X-Men #287-333, X-Men #25-50, Wolverine #93-100, X-Man #10-17, X-Men Unlimited #10-11, X-Force #52, Generation X #15, Cable #31-33, Excalibur #99. The road to Onslaught — seeds planted across the X-line leading to Xavier fall.
Collects X-Men #42-47, Uncanny X-Men #322-328, and more. The post-Age of Apocalypse era builds toward Onslaught with traitors and mysteries.