With the release of Captain America: Civil War just days away, Marvel fans are champing at the bit for any morsel they can find about the Marvel Cinematic Universe that they haven’t already discovered.

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Of course, if you’ve watched all of the movies enough times, you probably know nearly all there is to know about the MCU, but you what you might not know about are some of the behind-the-scenes secrets that could have fundamentally changed the entire franchise if things hadn’t (or had) gone exactly as planned.

In Screen Rant’s latest video, we get to explore the makings of Marvel’s movie universe, from casting decisions to budgetary constraints. For example, did you know that Tom Cruise was once in the running for the role of Iron Man? Or that Joss Whedon told Chris Hemsworth that he’d be perfect for the role of Captain America?

It’s impossible to imagine a better group of Avengers, especially a dozen films into the series, but a few open schedules or fickle executives could have changed the makeup of the cast entirely to something virtually unrecognizable.

There are plenty of other fun secrets too, including the fact that Marvel almost gave Hugh Jackman’s Wolverine a cameo role in Captain America: The First Avenger, but you’ll have to watch the video below to see them all:

Jacob started covering video games and technology in college as a hobby, but it quickly became clear to him that this was what he wanted to do for a living. He currently resides in New York writing for BGR. His previously published work can be found on TechHive, VentureBeat and Game Rant.