The MCU may have revolutionized the Superhero genre in TV and cinema, but plenty of Marvel characters were depicted in live-action media way earlier than you might think. In fact, some of Earth's Mightiest Heroes were present on-screen even around the same time as the first-ever comic books. It may have taken 80 years to perfect the formula, but superhero movies and TV shows were a large part of mid-20th-century entertainment – even if noticeably less prolific.
