Yes we have the DC Animated Universe which started in the 90s and the Star Trek series which were connected; but with Iron Man and the MCU that is how the idea of a shared on screen universe of films became popular and others followedIn the grand scheme of things, the shared universe concept is very new. The vast majority of movies, including comic book movies, have been stand alone.
Wish I’d have known at the time so I could have got some gardening done instead or returned some library books.


