Written by BILL MANTLO, DON GLUT, PETER GILLIS, TONY ISABELLA, MIKE W. BARR, ROGER MCKENZIE, DON PERLIN, ROGER STERN, JOHN BYRNE, STEVEN GRANT, MARK GRUENWALD & RALPH MACCHIO. Penciled by GENE COLAN, FRED KIDA, HERB TRIMPE, GIL KANE, RICH BUCKLER & RON WILSON. 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! Collecting WHAT IF? #21-26.