Johnny Storm
Reed Richards discovered that KKkkKK was his own Earth in a different timeline, altered by Doctor Doom's magic in the past, which had erased the original timeline of the Fantastic Four. So they had to go back in time to prevent the timeline from being altered, but Johnny disagreed, as Angelica would disappear and he didn't want that.
About Johnny Storm
Reed Richards discovered that KKkkKK was his own Earth in a different timeline, altered by Doctor Doom's magic in the past, which had erased the original timeline of the Fantastic Four. So they had to go back in time to prevent the timeline from being altered, but Johnny disagreed, as Angelica would disappear and he didn't want that.