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.

Anne Hathaway, wearing a tiara and formal dress, smiles at Robert Schwartzman in a scene from a movie, with both characters dressed in formal attire

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.

Timothée Chalamet and Stephen McKinley Henderson in military-style attire in scenes from "Dune."

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.

Top: Actor adjusting glasses, wearing a striped blouse; Bottom: Actor in a cream-colored gown with beaded details, indoors

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.

Top image: A woman emotionally holds a man's face. Bottom image: A woman in a futuristic outfit looks serious

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.

Terrence Howard and Don Cheadle are depicted as the character James "Rhodey" Rhodes in different scenes from the Iron Man movie series

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."

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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.”

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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.

Jeremy Renner and Alec Baldwin, both in suits, appear serious in a courtroom scene from a TV show or movie

Bryce Dallas Howard in two different scenes from "The Twilight Saga." The top image shows her smiling outdoors, and the bottom image shows her in a snowy forest, serious

Scenes from "The Karate Kid" show Ali Mills (Elisabeth Shue) and Daniel LaRusso (Ralph Macchio) at school, smiling and talking

Vince Vaughn and Julianne Moore work on a dinosaur, Jeff Goldblum stands with Vaughn in another scene from "The Lost World: Jurassic Park."

Top: Katie Holmes in a white shirt; Bottom: Maggie Gyllenhaal facing the Joker while wearing a formal dress

Top: Jodie Foster holds an ID badge in a serious scene. Bottom: Julianne Moore points a gun with focus

Laurence Fishburne as Morpheus in "The Matrix" in a black suit and green tie (top) and Yahya Abdul-Mateen II as Morpheus in "The Matrix Resurrections" in a blue suit (bottom)

Young girl in a salon with a butterfly shirt; woman in a period costume with a white blouse and dark bodice, outdoors