Collects Cable (1993) #32-33, Uncanny X-Men (1981) #333-335, X-Force (1991) #55, X-Man (1995) #15-17, X-Men (1991) #53-54, X-Men Unlimited (1993) #11, Onslaught: X-Men (1996) #1, Avengers (1963) #401, Fantastic Four (1961) #415. Everything changes for the Children of the Atom and Earth''s Mightiest Heroes! Behold the psionic force of nature known as Onslaught — but what dread foe could terrify the unstoppable Juggernaut? As Cable battles Post, herald of the oncoming doom, Nate Grey faces a ghost from his past — and Onslaught gathers his forces! The Avengers join the X-Men to work out a battle plan, but could the answers lie with finding Magneto? And Charles Xavier has a troubling proposal for the Fantastic Four. But when Onslaught''s identity is revealed, who will be the traitor to the cause?