One of the original X-Men, Jean Grey is also one of the most powerful telepaths on the planet. The first X-Man to face Onslaught, Jean teams up with the Juggernaut in an effort to stop him. But Onslaught trapping Juggernaut with his mystical Cytorrak gem, leaves Jean defenseless against his attack. Launching a powerful telepathic blast against Onslaught, Jean find out just how unstoppable he is. Responding to Jean's attack, Onslaught crushes her under a massive psionic attack of his own. Recovering to join the final assault against Onslaught, Jean focuses her power in the hop of saving Professor Xavier while still leaving the Onslaught entity destroyed.