If you've seen pretty much any recent Marvel movie -- X-Men, Spider-Man, Hulk, Fantastic Four, Iron Man, or others -- you may have noticed the legendary co-creator of some of the best superheroes in a few scenes.
In this week's episode of Trailer Mix, we explore our favorite fan theory that Stan Lee’s cameos in all of the Marvel Cinematic Universe movies are actually because he is the The Watcher.
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