Captain America's shield was supposedly frozen with Steve Rogers (Chris Evans) under ice until he woke up in 2011, so why was it briefly seen in Iron Man, in which events took place in 2008? As the first Marvel Cinematic Universe offering, the Robert Downey Jr. and Jon Favreau movie mostly focused on Tony Stark's heroic journey. But as the foundation of what would be the biggest interconnected franchise in Hollywood, it featured several Easter eggs teasing what was to come to the universe, including a brief shot of Steve Rogers' iconic shield.

After returning from being held captive by the Ten Rings in Afghanistan, Tony continued developing his metal suit. With significantly better conditions and access to his technology, Iron Man devoted a considerable amount of time with him in his workshop. After one of his first flights using his updated Iron Man red and gold suit, Pepper Potts (Gwyneth Paltrow) catches Stark as he's getting out of it. During their conversation, Captain America's unmistakable shield can be seen lying on one of his tables in the background. Given the official MCU timeline, this creates a plot hole as Captain America: The First Avenger revealed that Steve and his shield weren't unearthed until a few years later.

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Over the years, fans have come up with various explanations why the shield was in Tony's Malibu home workshop. Howard Stark (Dominic Cooper) closely worked with the Super Soldier program in the '40s and was actually the one who created Captain America's Vibranium shield, and some were convinced the one seen in Iron Man was a prototype of sorts. After all, it's not finished. This is a great explanation and is probably the best one yet, since it doesn't pose any issues with the established canon. While Marvel Studios hasn't directly said anything to address this mystery in terms of its in-universe implications, Favreau has actually come out and provided how that recognizable piece of prop made it into the film.

Tony Stark getting out of his suit

As it turns out, the decision to sneak in Captain America's shield in the first Iron Man film was intentional. In an MTV interview in 2010 on the heels of the release of Iron Man 2, Favreau said that it was an Industrial Light and Magic artist who jokingly put it there for the production's cineSync session while approving the movie's visual effects. It was a hit to the team, so the director decided to keep it there, interested in knowing if moviegoers would notice it. Not only did fans spot the shield, they also made a big deal out of it. This led them to fully acknowledge its existence in Tony's workshop in the sequel.

Marvel Studios is known for playing the long game, and they usually sneak in small details in the film that usually becomes significant in future films. Things were a little different in the case of Captain America's shield in Iron Man because Favreau had to make sense of what was supposed to be just an internal gag for those who worked in the movie. In any case, the explanation worked well in terms of MCU's overall narrative, especially when it comes to the relationship between Tony Stark and Steve Rogers.

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