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Marvel first owned the comic book world, then they owned the animated world, then they conquered movie theatre box offices, and now with Disney+ they're coming for live action TV shows.

But it all starts in the pages of Marvel comics books. Actually, for some of the biggest heroes, their comic book journey even started before Marvel was known as Marvel. Think, Captain America for example.

So whether you love these heroes from the MCU movies, or TV shows, here's where they got their start in the colorful splash pages of comic books...

Here Is The First Comic Book Appearance For These MCU Heroes