series, including the "Wha-Huh?" humor issue, was later collected into a trade paperback entitled What If: Why Not. Volume 4 (early 2006) The February 2006 one-shot issues took place in a single fictional universe, dubbed Earth-717 in previews, with four of the six stories more like DC's Elseworlds with various heroes in historical periods. What if Captain America had lived in the American Civil War? What if the Fantastic Four were Russian cosmonauts? What if the Sub-Mariner had grown up on land instead of Atlantis? What if Daredevil had lived in feudal Japan? What if Thor was a Herald of Galactus? What if Wolverine was Public Enemy Number One? The series was later collected into a trade paperback entitled What If: Mirror Mirror. Volume 5 (late 2006) The November 2006 one-shot issues were based on major storylines or crossovers: What If: Avengers Disassembled - What if the Scarlet Witch had not acted alone? What If: Spider-Man: The Other - What if Peter Parker had rejected his inner spider? What If: Wolverine: Enemy of the State - What if Wolverine was never deprogrammed? What If: Age of Apocalypse - What if both Xavier and Magneto were killed by Legion? What If: X-Men: Deadly Genesis - What if Vulcan became the leader of the X-Men? The series was later collected into a trade paperback entitled What If: Event Horizon featuring the cover from the Spider-Man one-shot. Volume 6 (2007) The sixth series of What If? continued the theme of the previous series of examining possible alternatives for major storylines. What If: Planet Hulk What if Caiera the Oldstrong had survived the destruction on Sakaar instead of the Hulk? What if the Hulk had landed on the planet the Illuminati had intended for him? What if the Hulk had reverted to Bruce Banner when he crashed on Sakaar? What If: Annihilation What if the Annihilation Wave reached Earth? What If: X-Men: Rise and Fall of the Shi'ar Empire What if Vulcan absorbed the energies of the M'Kraan Crystal and became Phoenix? What If: Civil War What if Captain America led all the heroes against the Superhero Registration Act? What if Iron Man lost the Civil War? What If: Spider-Man vs. Wolverine What if Spider-Man had remained in 1980s Russia after an accidental death? The series was also due to feature What If?: The New Fantastic Four, which featured the "original" New Fantastic Four