We’ve been living inside the Marvel Cinematic Universe for the past 15 years, bearing witness to one of the biggest sea changes in the entertainment industry since Georges ​​Méliès landed a spaceship on the moon.

Superhero movies and fandom culture have completely changed the way we consume content, to the point that it’s difficult to imagine a world where Robert Downey Jr. didn’t play a guy in a red metal suit for 10 years. But because these movies go through so many iterations before the final product we see on the silver screen, that world is closer than we might think.

To celebrate 15 years of Iron Man and the MCU, we’ve compiled a list of the 15 biggest and strangest what-ifs of Marvel movie history. Join us as we enter the multiverse, imagining a cinematic universe very different from the one we know and love.

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Dan Abnett remembers when he learned his semi-obscure comic book was becoming a movie.

“I got a call from the editor who said, ‘You’re never gonna guess the next Marvel movie,’” Abnett tells Inverse. At the time, the Marvel Cinematic Universe had only just successfully launched with hits like Iron Man, Thor, and Captain America: The First Avenger. That’s when Abnett heard whispers Marvel Studios was looking to make a space sci-fi. He assumed it would be Silver Surfer.

“They went, ‘No, it’s Guardians of the Galaxy. And it’s our Guardians,’” Abnett says. “I was astonished.”