So, he simply just disappears afterDune.
There are obviously spoilers ahead for several movies.
The sequel briefly explained that Michael was out on tour with his band, hence his absence.

2.InDune, Stephen McKinley Henderson stars as Thufir Hawat, the Mentat for House Atreides.
The character plays an important role in the first movie, as well as the book byFrank Herbert.
However, Thufir is absent fromDune: Part Twoand isn’t mentioned.

I said, ‘OK, good, fine, bye.'"
4.Emma Fuhrmann played a teenage version of Cassie Lang, Scott’s daughter, inAvengers: Endgame.
However, when Cassie returned inAnt-Man and the Wasp: Quantumania, Emma was replaced by Kathryn Newton.

Don went on to portray the character in all subsequent Marvel Cinematic Universe movies.
6.In 1994, Keanu Reeves starred as Jack Traven inSpeedalongside Sandra Bullock as Annie Porter.
The sequel explains Jack’s absence by saying Jack and Annie broke up.

Recently, Jeremyexplainedhe stepped away from the franchise to focus on his family.
9.Rachelle Lefevre starred as Victoria Sutherland in the first twoTwilightmovies in 2008 and 2009, respectively.
Then, for the third installment, Rachelle was recast and Bryce Dallas Howard took over the role.

At the time, Rachellesaidshe was “stunned” by the decision to recast her.
Ralph Macchio explained how he now regrets how he handled Elisabeth not being part of the sequel.
When that character was written off, I would’ve picked up the phone."

12.In 2005, Katie Holmes notably starred as Rachel Dawes in Christopher Nolan’sBatman Begins.
But then, Katie stepped away from the role and was replaced by Maggie Gyllenhaal inThe Dark Knight.
Before taking over the role, MaggiecontactedKatie to double-check she “had her blessing.”

Instead, Julianne Moore replaced Jodie and appeared alongside Anthony Hopkins as Dr. Hannibal Lecter.
Instead, Yahya Abdul-Mateen II played an AI based on Morpheus in the fourth movie.
15.And finally, Rachel Covey starred as the adorable Morgan, Robert’s daughter, inEnchanted.







