The Marvel Cinematic Universe began in 2008 with Iron Man, and for the next few years, it seemed as if Marvel Studios was trying things out to see what worked. Gradually, the studio built up enough characters for a movie featuring all of them, and in 2012, Marvel's The Avengers hit theaters to widespread critical acclaim. The MCU proved it could be done - a single movie featuring six major stars playing incredibly important characters could work, and it made the studio a lot of money.
The Avengers exceeded all expectations, helping make the MCU into the most successful film franchise of all time. It wasn't long before the studio began development of a sequel, and a few years after the first movie was released, audiences around the world were treated to Avengers: Age of Ultron. Like any offering from the MCU, Age of Ultron has been scrutinized by the fans, but there's always something new to learn about Earth's Mightiest Heroes and some of the impressive battle scenes they've been in over the years.
That's especially true when you're looking at some of the things that happened behind the scenes. Age of Ultron certainly had a lot going on that wasn't revealed until much later, and when you find out what those things were, you're going to want to go back and rewatch it. This list compiles some of the most fascinating behind-the-scenes facts from Age of Ultron that'll make you want to sit through it all over again! Take a look down below, and don't forget to upvote your favorites before you head back to the couch to chill with Earth's Mightiest Heroes for a couple of hours.
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Andy Serkis Did Far More Than Play Ulysses Klaue
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Stan 'The Man' Lee's Favorite Cameo Is In 'Age of Ultron'
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A Lot Of Detail Went Into The Hulkbuster Armor
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Scarlett Johansson Worked With Three Stuntwomen To Hide Her Pregnancy
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Andy Serkis Was Cast To Play Klaue Because Of A Fan
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For Joss Whedon, James Spader Was The Only Option For Ultron