Personally since it is all but a formality that Reed, Sue, Johnny, Ben, Victor Von Doom, etc. are on their way home back to Marvel since they more or less have the rights back, it begs the question of how you would introduce the Fantastic Four into the MCU?
Here is how I would do it:
- Well in Spider-Man Homecoming, Tony Stark/Iron Man (Robert Downey, Jr.) sold the Avengers Tower but we never knew just who bought Avengers Tower; so what if they could reveal that the Leland Baxter Paper Company purchased the Avengers Tower. The tower would, therefore, become the Baxter Building.
In the comics, the Baxter Building is in New York City and its where the Fantastic Fours headquarters is located. The Leland Baxter Paper Company owns the building, but the Fantastic Four purchase the top five floors.
This would allow for an iconic landmark to stay in New York City, and it would retroactively make it appear that Marvel was setting up the Fantastic Four years in advance.
- Or another way being:
- Reed Richards, Sue Storm, Johnny Storm and Ben Grimm are all scientists of S.H.I.E.L.D. who went missing after being on a space mission for decades. However, they find their way back to Earth post-Avengers 4 and have already come into their powers. We could see this all in Avengers 4 like in a post-credit scene or something as a means of introducing them or seeing it in their own film like in the first act. You pretty much skip over their origin and differentiate from the 2005 and 2015 versions but make it better.
Here is how I would do it:
- Well in Spider-Man Homecoming, Tony Stark/Iron Man (Robert Downey, Jr.) sold the Avengers Tower but we never knew just who bought Avengers Tower; so what if they could reveal that the Leland Baxter Paper Company purchased the Avengers Tower. The tower would, therefore, become the Baxter Building.
In the comics, the Baxter Building is in New York City and its where the Fantastic Fours headquarters is located. The Leland Baxter Paper Company owns the building, but the Fantastic Four purchase the top five floors.
This would allow for an iconic landmark to stay in New York City, and it would retroactively make it appear that Marvel was setting up the Fantastic Four years in advance.
- Or another way being:
- Reed Richards, Sue Storm, Johnny Storm and Ben Grimm are all scientists of S.H.I.E.L.D. who went missing after being on a space mission for decades. However, they find their way back to Earth post-Avengers 4 and have already come into their powers. We could see this all in Avengers 4 like in a post-credit scene or something as a means of introducing them or seeing it in their own film like in the first act. You pretty much skip over their origin and differentiate from the 2005 and 2015 versions but make it better.