In 1940, Marvel Comics (then called Timely Comics) established the idea of a shared universe by having Namor the Sub-Mariner and the Human Torch meet and fight in a story that could have been resolved in a few minutes if the men had just been willing to listen to the one woman.

https://www.youtube.com/watch?v=iEZjNjXQKpw

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Marvel Mystery Comics #8-10 (Namor vs. the Human Torch) - Atop the Fourth Wall

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