Collects What If (1977-1984 1st Series) #21-26.
Cover by JOHN BUSCEMA. Captain America as the President of the United States? The Hulk a microscopic warlord? Doctor Doom a hero? Gwen Stacy...alive? Only a few of the dynamic dimensional divergences in the Fourth Volume of Marvel's original alternate earth epics! Featuring the Fantastic Four, the Avengers, the Man-Thing and more! Plus revelations of some of the Marvel Universe's most Eternal secrets!