Marvel creator Stan Lee has already a long list of cameos in Marvel films, as well as other geek-friendly films and TV shows. It's pretty much his trademark to make these little appearances and as long as he's alive, he'll probably show up in future Marvel films again. It makes sense since it was already revealed that he's playing The Watcher. The image was shared by Redditor AgentoMarvel. Check it out:
Check out this breakdown via Comicbook.com:
Here's a video montage of Stan Lee's cameos by SuperHeroesEvolution:
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