Fantastic Four (1961) 341-A

"The Ultimate Solution"

Reed figures out the one weapon that can defeat Galactus, the Ultimate Nullifier as they set off to find it. But first they return to the former spot of the Celestial's hideout to find Sue and Johnny alive. They gather up the two members and head off to Galactus' ship. Once there, they find the Nullifier but Sue takes it, since she is now possessed by Nebula. Nebula switched bodies during the blast and now threatens to nullify everyone. But her plan turns against her as Iron Man jolts Sue's body enough for Nebula to be expelled. The FF take the Nullifier back to Galactus who activates it and destroys himself. The FF out run the nullifier but loose Thor and Iron Man just before arriving home. But they do not realize that time has changed ever so slightly.