The original Avengers imagined for the cinema were very different and to understand it we must go back to a difficult period of the House of Ideas, the 90s.
During this period, Marvel was on the verge of bankruptcy and was trying to sell its film properties to various companies in an attempt to keep their heads out of the water. However, when he saw the performance of films like Spider-Man and X-Men , he decided to build his own universe.
Between 2004 and 2005, the colossus obtained a loan of 525 million dollars in an attempt to start its own film franchise. The idea? Take the scraps, or characters that had not yet sold and tur.n them into figures of certain appeal to make a franchise. That year Marvel published the list of ten properties they wanted to use to get back to the top: Captain America, Power Pack, Shang-Chi, Hawkeye, Nick Fury, Black Panther, Ant-Man, Cloak & Dagger and The Avengers.
Doctor Strange was supposed to be the Iron Man of the situation but then seeing the success of the film in 2008 became Tony Stark the pivot of the MCU we all know. A great credit for the success of all this and the arrival of Avengers: Infinity War is certainly to be entrusted to President Kevin Feige who has always believed in it.