It's not unusual for a Marvel Studios movie to have an unfinished script or for things to drastically change while filming, as was the case with the original iron Man movie back in 2008. Therefore, even though the Russos have stated that filming for Avengers: Doomsday begins today, MCU fans shouldn't be overly concerned about rumors that the current script isn't finalized yet.
 
But according to new sources, there's a very unique reason why the script hasn't been approved. The reason for this is that Marvel Studios hasn't signed every actor that wants to be in the movie yet.


According to the most recent rumors, Halle Berry and other original Fox era X-Men are reportedly in talks to rejoin the team but have not yet signed.
 
Chris Evans, whose Marvel contract with Avengers: Endgame expired, is another.  The fact that Robert Downey Jr.'s enormous Marvel salaries are well known definitely doesn't help either, since agents for some of the more well-known celebrities are prone to want to up their client's fee.  


Along with Evans and Berry, Jeremy Renner and Mark Ruffalo were not included in the casting announcement.  It was also unclear whether chris Pratt's Star-Lord and Rocket's new Guardians team were real.
 
Hugh Jackman and Ryan Reynolds as Deadpool and Wolverine, as well as the three live-action Spider-Men—Tobey Maguire, Andrew Garfield, and tom Holland—were all conspicuous omissions.
 
Possibly some names weren't omitted to preserve confidentiality because Marvel is unsure if they will be able to contract their individual actors, or possibly Kevin Feige recently stated that the entire Endgame cast wasn't announced during the livestream.


As new performers sign on or others make it apparent they won't be returning, fight scenes and significant storyline revelations may change every day.
 
Marvel Studios recently revealed the official cast for Avengers: Doomsday, which consists of a mix of the new Fantastic Four from the MCU, returning Fox X-Men characters, and well-known MCU heroes.  



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