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Tom Cruise - Tom Cruise is a formidable actor who’s known around the world. However, he will no longer play Jack Reacher.

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Tom Cruise - 'Jack Reacher' is a book series authored by Lee Child. It's already been adapted as a film series, but Child has swapped out Cruise for a new actor, who will star in a new series.

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Terrence Howard - Howard lit up the screen in 'Iron Man,' playing the superhero James Rhodes (War Machine).

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Don Cheadle - But Don Cheadle replaced Howard in the series, starting with 'Iron Man 2' in 2010.

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Kevin Spacey - Spacey was the original lead in 'All the Money in the World,' a biographical drama based on the kidnapping of John Paul Getty III in 1973.

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Christopher Plummer - However, after Spacey was hit with sexual assault allegations, he was replaced with Christopher Plummer.

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Richard Harris - Harris was the original Albus Dumbledore, appearing in the first two 'Harry Potter' movies.

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Michael Gambon - Unfortunately, Harris passed away in 2002. As a result, Michael Gambon replaced him as the headmaster of Hogwarts.

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Katie Holmes - Holmes starred as Rachel Dawes, Batman’s lover, in 'Batman Begins.' However, she decided not to return for 'The Dark Knight.'

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Maggie Gyllenhaal - Instead, Maggie Gyllenhaal was cast as Dawes. Holmes told MTV she "had a great experience working with Chris Nolan," but chose to star in 'Mad Money' instead.

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Janet Hubert - Janet Hubert is best known for playing Vivian Banks in 'The Fresh Prince of Bel-Air,' from seasons one through three.

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Daphne Reid - However, she was replaced by Daphne Reid in 1993. In 2011, Hubert told TMZ that she'd "never do anything with an a**hole like Will Smith."

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Luke Grimes - In 'True Blood' season six, Luke Grimes played James Kent.

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Nathan Parsons - In season seven, Grimes was swapped out for Nathan Parsons.

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Conan Stevens -

This actor originally played Gregor Clegane, A.K.A. "The Mountain," in season one of 'Game of Thrones.'

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Ian Whyte/Hafþór Júlíus Björnsson - In season two, Ian Whyte (left) stepped in to play The Mountain. For season three, Hafþór Júlíus Björnsson (right) was cast, and has played the character ever since.

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Rachelle Lefevre - For the first two 'Twilight' films, the character of Victoria was played by Rachelle Lefevre.

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Bryce Dallas Howard - For 'Eclipse,' the actress was replaced by Bryce Dallas Howard. Lefevre said she was "stunned" to learn she was replaced, and that she was "fully committed to the 'Twilight' saga.”

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Eric Bana - The Incredible Hulk has been played by many actors. From 2003 to 2012, the superhero was played by three actors, starting with Eric Bana in 'Hulk.'

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Edward Norton/Mark Ruffalo - Edward Norton stepped in for 'The Incredible Hulk' in 2008. Then he was replaced by Mark Ruffalo in 'The Avengers,' which came out in 2012.

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Shannen Doherty - Shannen Doherty (center) starred as Prue Halliwell in 'Charmed,' from season one to season three.

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Rose McGowan - "There was too much drama on the set and not enough passion for the work," Doherty said. She left the show after season three, and Rose McGowan (left) stepped in to play the character’s estranged sister.

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Shannen Doherty... again - Doherty (center) wasn’t just replaced in 'Charmed.' She was once the star of 'Beverly Hills, 90210,' playing the cunning Brenda Walsh.

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Tiffani Thiessen - Doherty left after four seasons, and Tiffani Thiessen stepped in as Valerie Malone, effectively replacing Doherty’s character.

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Shailene Woodley - In 'The O.C.,' the character of Kaitlin Cooper was originally played by a young Shailene Woodley.

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Willa Holland - After Woodley went off to boarding school, Willa Holland was cast as her replacement for season three.

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