What If?

Marvel.
Volume 1 (1977)
What If? Classic Vol. 1 (1-6; w Roy Thomas, Jim Shooter & Don Glut; a Jim Craig, Herb Trimpe, Gil Kane, Frank Robbins, George Tuska & Rick Hoberg). [From Marvel Comics: Because YOU demanded it: The first six awe-inspiring issues of the most awesomely offbeat series of all time — collected in one sense-staggering volume...
WHAT IF? (Vol. 1) #1 - What if Spider-Man Joined the Fantastic Four?
WHAT IF? (Vol. 1) #2 - What if the Hulk Had Always Had Bruce Banner's Brain?
WHAT IF? (Vol. 1) #3 - What if the Avengers Had Never Been?
WHAT IF? (Vol. 1) #4 - What if the Invaders Had Stayed Together After World War Two?
WHAT IF? (Vol. 1) #5 - What if Captain America and Bucky Had Both Survived World War II?
WHAT IF? (Vol. 1) #6 - What if the Fantastic Four Had Different Super-Powers? Six titanic tales of triumph and tragedy in the mighty Marvel tradition!]
What If? Classic Vol. 2 (7-12; w Don Glut, Jack Kirby; a Jack Kirby, Rick Hoberg, Bill Black, Sal Buscema, Alan Kupperberg, Jim Mooney). [From Marvel Comics: Daredevil’s secret exposed? The identity of Thor passed down to another? A new Hulk? Multiple Spider-Men? Some of the ideas that shook Marvel’s foundation got their start right in the realm of remote possibility overseen by the wondering Watcher! But can even Uatu believe his eyes when Jack “King” Kirby rewrites himself and his fellow legends as the Fantastic Four? Plus: from a concept by Roy Thomas, the Avengers of 1958!]
What If? Classic Vol. 3 (14-15, 17-20; w Gary Friedrich, Don Glut, Marv Wolfman, Steven Grant, Peter Gillis; a Herb Trimpe, John Buscema, Walt Simonson, Carmine Infantino, Ross Andru, George Perez, Tom Sutton, Pat Broderick). [From Marvel Comics: It’s alternate-Earth anarchy as Doctor Strange, Captain Marvel, Ghost Rider, Spider-Woman, Nova and Shang-Chi are turned against humanity when fate is tossed a twist by that infamous question mark! Plus: The Howling Commandos fight for Earth, and Spider-Man fights for...ratings!? Featuring the Fantastic Four, Daredevil and Hellstorm!]
What If? Classic Vol. 4 (21-26; w 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; a Gene Colan, Fred Kida, Herb Trimpe, Gil Kane, Rich Buckler, Ron Wilson). [From Marvel Comics: 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!]

Best of What If? (1,8,24,27,28,32,36; w Roy Thomas, Scott Shaw, Tony Isabella, Jo Duffy, Frank Miller, Mike W. Barr, Mark Gruenwald, Peter Sanderson, John Byrne; a Jim Craig, Scott Shaw, Gil Kane, Jerry Bingham, Frank Miller, Klaus Janson, Greg LaRoque, John Byrne). [Contents:
WHAT IF? (Vol. 1) #1 - What if Spider-Man Joined the Fantastic Four?
WHAT IF? (Vol. 1) #27 - What if Phoenix Had Not Died?
WHAT IF? (Vol. 1) #28 - What if Daredevil Became an Agent of Shield?
WHAT IF? (Vol. 1) #24 - What if Gwen Stacy Had Lived?
WHAT IF? (Vol. 1) #32 - What if the Avengers Had Become the Pawns of Korvac?
WHAT IF? (Vol. 1) #8- What if the Spider Had Been Bitten by a Radioactive Human?
WHAT IF? (Vol. 1) #36 - What if the Fantastic Four Had Not Gained Their Powers?]
Volume 2 (1989)
X-Men: Alterniverse Visions (40, 59, 62, 66, 69; w Ann Nocenti, Simon Furman, Kurt Buriek, Mariano Nicieza; a Steven Carr, Bryan Hitch, Ron Randall, John Royle, J. R. Justiniano). [Contents:
WHAT IF? (Vol. 2) #40 - What if Wolverine Led Alpha Flight?
WHAT IF? (Vol. 2) #59 - What if Storm Remained a Thief?
WHAT IF? (Vol. 2) #62 - What if Rogue Possessed the Power of Thor?
WHAT IF? (Vol. 2) #66 - What if Stryfe Killed the X-Men?
WHAT IF? (Vol. 2) #69 - What if Wolverine Battled Weapon X?]
Galactic Storm 2 (55-56). [For full contents, see under Avengers.]
Misc.
What If..?: Why Not (w Brian Michael Bendis, Karl Kesel, Ed Brubaker, Chris Claremont, Peter David; a Michael Lark, Michael Gaydos, Paul Smith, Tom Raney, Pat Olliffe, Andrea DiVito; contains 6 2004 1-shots; see details in description). [From Marvel Comics: In the proud tradition of its late, lamented series of the seventies and eighties, the House of Ideas once again poses the question, "What if?" The hottest creators in comics take on Marvel's top characters – turning their lives upside-down in the name of entertainment! Featuring decidedly different interpretations on Daredevil, the Avengers, the Fantastic Four, Spider-Man, the X-Men, the Hulk and more! Collects What If Jessica Jones Had Joined the Avengers?, What If Karen Page Had Lived?, Wha…Huh?, What If Aunt May Had Died Instead of Uncle Ben?, What If Dr. Doom Had Become the Thing?, What If Magneto Had Formed the X-men with Professor X?, And What If General Ross Had Become the Hulk?]
What If..?: Mirror Mirror (w Tony Bedard, Rick Veitch, Mike Carey, Greg Pak, Robert Kirkman, Daniel Way; a Carmine Di Giandomenico, Tommy Lee Edwards, Marshall Rogers, David Lopez, Michael Oeming, Jon Proctor; contains 6 2005 1-shots; see details in description). [From Marvel Comics: What if...Captain America fought in the Civil War? What if...the Fantastic Four were Cosmonauts? What if...Daredevil lived in feudal Japan? What if...Namor grew up on land? What if...Thor was a herald of Galactus? What if...Wolverine was Public Enemy No. 1 in mob-ridden 1920s Chicago? Hacking into the internet of an adjacent reality, teenager Hector Espejo discovers these and other startling stories -- and learns that eavesdropping on a sinister parallel universe can be highly addictive!]
What If..?: Event Horizon (w Jeff Parker, Peter David, Jimmie Robinson, David Hine, Rick Remender; a Aaron Lopresti, Khoi Pham, Carmine DiGiandomenico, David Yardin, Dave Wilkens; contains 5 2006 1-shots; see details in description). [From Marvel Comics: Marvel once again poses the question, "What If...?" In “The Other,” Peter Parker returned from the dead and embraced his “inner spider.” But what if he had been completely consumed by his inner, bestial impulses and became more spider than man? "Disassembled" was the darkest day in Avengers history. But what if the greatest threat had gone undetected? Hydra made Wolverine an "Enemy of the State." But what if the world’s deadliest killing machine was never de-programmed? In "Deadly Genesis," Professor X sent a secret squad of young mutants to the living island, Krakoa, in an ill-fated attempt to rescue the original X-Men before he formed the now-famous All-New, All-Different team. But what if this second team had survived? Attempting to slay Magneto Legion accidentally killed Professor X, giving rise to the "Age of Apocalypse." But what if Legion killed both Magneto and Xavier, leaving no leader to create any incarnation of X-Men to resist the onslaught of Apocalypse?]