Why is there an anthology story about the FF? I guess to give Bob DeNetale a chance to write about them? Because it’s definitely not because the story is so “important” that it had to be told despite the fact that there’s already a regular FF book.
It takes place when Reed and Sue were living in the suburbs. Reed brings a shapeshifting demon to the house, by accident. It takes on the team-members forms and has one-on-one fights with them before Reed sends it back.