"Fantastic Four: Foes, Part Three"
On a scouting mission in the Negative Zone, the Fantastic Four discover two Annihiluses, or "Annihili", as Johnny terms them. The FF leave them to fight it out over who has stolen/hidden the Cosmic Control Rod.
Back in the positive matter universe, Sue Richards picks Franklin up from school, only to later learn it was the Super-Skrull posing as her son to gain access to the Baxter Building's advanced technology.
Needless to say, the ruse is not appreciated by a frantic, frenzied mother in the shape of Invisible Woman.