Marvel Comics has long been the kind of company that honors its fans' requests in a number of fun and interesting ways. Back in 1977, the company tried something new by releasing a series titled What If...? with each issue focusing one or more stories related to their previously published titles. Instead of Spider-Man getting rejected from the Fantastic Four in The Amazing Spider-Man #1, why not see What If... Spider-Man JOINED The Fantastic Four?
Titles like that explored how the Marvel Universe might have turned out differently if just one thing was altered from how it actually played out. Each comic essentially created what would become Marvel's Multiverse in that each issue was basically a separate universe depicting a slight change (or sometimes a wild change) from what happened in Marvel's prime universe, otherwise known as Earth-616. Some of the stories were so successful and beloved, parts of a few found their way into canon eventually.
What If...? has been a popular series for Marvel Comics for decades, and it's even going to be made into a new animated TV show for Disney's new streaming service, Disney+. That's going to hit the platform within the first year of release, but before that happens, why not take a look at the many What If...? titles Marvel has published over the years and rank up your absolute favorite to see which one rises to be the best of them all!