Fantastic Four, Vol. 3 #551A

Epilogue, Chapter One: The Beginning of the End
As the Fantastic Four return from a victorious battle over Diablo, they discover that someone has made a temporal incursion into Reed's lab. There they find Namor, the Black Panther and their nemesis Dr. Doom... all from 75 years in the future. They've traveled back in time to try to persuade the Fantastic Four to avoid making a horrible mistake... letting Reed Richards fix the world.
Release Date: 2008