Television Crossover Universe

I first became aware of the fictional crossover/shared reality concept when I was five years old. As my family was about to embark on a drive from Massachusetts to California, my father gave me my first comic book to keep me occupied, and it was an issue of the Marvel Comics adaptation of Scooby’s All-Star Laff-A-Lympics. This is the first time I was able to comprehend what was going on here, on a significant level. All these characters from their own cartoons were appearing together, as part of the same reality, thus placing all their previous cartoons in the same reality. From that point on, I started becoming more aware. As I started reading more comics, I noticed how all the DC characters lived on one world while the Marvel characters lived on another, and I mostly only bought team and team-up books. Of course, once Superman met Spider-Man, my mind was blown again. For the purpose of this post, we will focus on the silver age Superman, who was Superboy, and whose adventures w