Stan Lee
Stan Lee loved a shared universe. Prior to 1961, comic book crossovers between series within the same company rarely happened. Team books like JSA and 7 Soldiers had team-ups of series leads but that never spilled over into individual titles. There was the one time that the JSA met Hop Harrigan, and that time the Sandman interacted with the Newsboy Legion and the Boys Commandos. Over in Marvel, we had the Human Torch fighting Sub-Mariner. Fawcett had a few rare team-ups as well outside the Marvel Family. In the 50s, Worlds Finest brought the worlds of Superman and Batman together, and that would sometimes spill over into other titles. And Adventure Comics played with some inter-series crossovers between Superboy, Green Arrow, and Aquaman. When pre-Marvel tried to bring back the Golden Age in the 50s, we got to see Cap meeting Human Torch and Sub-Mariner. But then Stan Lee, tired of the same old comics, decided to quit. His wife convinced him that before he does tha...