Fantastic Four Vol. 1 Issue 415

Onslaught crossover (Phase 1)
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"Onslaught Phase 1: An Enemy Among Us"

The evil of Onslaught descends on Four Freedoms Plaza! And the powerful psionic entity wants young Franklin! But the assembled Avengers, X-Men, and Fantastic Four arent going to let Onslaught take Reed and Sues son without a ferocious fight! First Onslaught battles Crystal and Johnny! Then clashes with Lyja, Hawkeye, and finally challenges Bishop and the Invisible Woman! Can anyone stop Onslaught and save Franklin?
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The events of this story run concurrently with the following Onslaught related titles: Avengers #401, Excalibur #100, Incredible Hulk #444, X-Factor #125, and X-Men Vol 2 #55.