▲The actor played the roles of Hulk/Bruce Banner in the movie 'The Incredible Hulk' however, he was not called back to star in 'The Avengers.' According to Den of Geek, Marvel Studios wanted an actor who embodied the same creativity and collaborative spirit as the rest of the crew and cast mates.

▲Gosling was originally cast as the father in 'The Lovely Bones.' He put on 60 lbs (27 kg) for the role, but that didn't sit well with Director Peter Jackson, who didn't see the vision. "We had a different idea of how the character should look," Gosling told The Hollywood Reporter.

▲The main character in the animated film 'Chicken Little' was actually meant to be female. Hunter took months to voice the character. According to the Screen Rant, the production team later decided that the character should be male and Hunter's work was replaced by Zach Braff.

▲From 1984 to 1991, the actress played the role of Denise Huxtable in the series 'The Cosby Show.' According to The Richest, after the seventh season of the series the director decided to let the actress go due to creative differences.

▲After finishing recording the voice of the lively character Paddington, producers thought Firth's voice was too mature and hired Ben Whishaw to take his place instead, according to Screen Rant.

▲According to CinemaBlend, after receiving the script for 'Beverly Hills Cop,' Stallone tried to rewrite the role he would play. The studios did not like the idea and Eddie Murphy was hired to replace him.

▲When she was 11, the actress was hired to voice the character Penny in the animated film 'Bolt.' Even after she finished recording all the lines for the character, Disney still ended up hiring Miley Cyrus in place of Moretz, according to the Screen Rant.

▲The producers of 'Two and a Half Men' chose to fire the actor after he made nasty comments and failed to attend a rehabilitation program, according to People.

▲The actor had been chosen as the lead character in 'American Psycho;' however, after learning that DiCaprio was available, they temporarily cast him instead. When DiCaprio became unavailable in favor of a different movie, the producers went back to their original choice. Speaking to The Wall Street Journal, Bale revealed that he had always believed he would end up getting the part... and he did!

▲After making some unpleasant comments about the director of 'Transformers 3,' the actress was fired from the cast and they cast Rosie Huntington-Whiteley for her role instead. According to Wonderland, Fox revealed that director Michael Bay was like a dictator during filming.

▲In April 2016, it was announced that the actress would not be returning to the newest season of 'Castle,' and a month later the series was canceled. Before being canceled, the producers were all set for the next season and implied that Katic would not be necessary for the new season, Us Weekly reveals.

▲Howard had signed a contract be in the three 'Iron Man' films. When it came time to shoot 'Iron Man 2,' Howard was told he would be receiving less money than had initially been agreed upon, because the film did not require his participation to be a success, according to Screen Rant. The actor did not accept and was eventually replaced by Don Cheadle.

▲The actress played the role of Charlie Sheen's girlfriend in 'Anger Management.' She was fired in 2013 and filed suit against Sheen and the production team demanding the money she would have received had she not been fired, the Daily Mail reports. Blair was fired after complaining that during filming the rest of the team had to wait for Sheen to memorize his lines.

▲Tori Spelling revealed to Us Weekly that after some incidents involving Doherty on the set of 'Beverly Hills 90210,' she phoned her father Aaron Spelling, creator and producer for the series, asking him to fire Doherty... and so she was axed.

▲After starring in four seasons of 'Gossip Girl,' her character's story line finally came to an end. According to Elle, during the fourth season of the series, the actress was not very present and the directors also thought she could have been giving more in her performances.

▲The actress was one of the protagonists of the comedy show 'Three's Company.' According to The Hollywood Reporter, Sommers was fired after having asked for a salary increase.

▲There are several theories about the decision of doing away with the actor on the set of 'Predator.' According to GeekTyrant, Van Damme, who played Predator, did too many kickboxing movies, which was going against what the director wanted. He was subsequently let go.

▲After making homophobic remarks about fellow cast member T.R. Knight, Washington was immediately dismissed from the cast of 'Grey's Anatomy,' as told by by Marie Claire.

▲The actor was the first choice for the role of Marty McFly in the movie 'Back to the Future.' In the first weeks of filming, the production team realized that Stoltz was the wrong choice and hired Michael J. Fox instead, Vulture reports.

▲It was during the post-production phase of the movie 'Her' that Spike Jonze realized that Morton was not the right person for the role. Scarlett Johansson was then hired instead, Vulture says.

▲Since the premiere of 'Criminal Minds' in 2005, the actor was part of the cast; however, in 2016, after an argument on set over a line in the script, the actor was eventually fired from the series, Variety reveals.

▲During the period in which he was working on the series 'Dr. House,' Penn was invited to join the Obama administration. Even though he made the decision to commit to his role until the end, the production team killed him off the series, as revealed by CNN.

▲The actress worked as an executive producer on 'The Talk' before she was fired in 2012. According to People, Remini later went on to state that her dismissal was 'absolutely' the right choice, as she believes her bosses on the show would have wanted her to stay quiet and do what she's told - and that just wouldn't fly with the actress' outspoken personality.

▲Just a day before the first official day of shooting for 'The Lord of the Rings: The Fellowship of the Ring,' Townsend was fired. The actor would supposed to portray Aragorn, according to The Telegraph.

▲During the shooting of the movie 'Valley of the Dolls,' the iconic actress did not make a good impression and ended up being fired, says Mental Floss.

▲After only a week of filming, Remar was fired from the cast of 'Aliens'. According to Screen Rant, this was due to problems related to the actor's substance use.

▲Hayes was completely caught off-guard when she learned that her character on 'Kevin Can Wait' would be killed off after the first season, reveals Fox News. Leah Remini was then cast for season two.

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After a real scandal over allegations of domestic violence, the actor was immediately dismissed from the cast of 'Scandal,' reports TMZ.

▲Julianne Moore was fired from Oscar-nominated film 'Can You Ever Forgive Me?' because she wanted to wear a fat suit and a false nose, according to actor Richard E Grant.

▲Initially it was going to be Hathaway who would take on the role of one of the protagonists in 'Knocked Up.' In the film, the director wanted to shoot a very realistic delivery scene. In an interview with Allure, Hathaway revealed that she was not comfortable with the scene since, at the time, she hadn't experienced childbirth before. The role was given to Katherine Heigl.

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Some of Hollywood's greatest personalities have had several career lows, including getting fired! There can sometimes be a few different reasons that lead up to the dramatic decision of letting an actor or actress go, but despite the on-set drama, lots of times these productions go on to achieve great success all the same.
Click through this gallery to learn all about the juicy, behind-the-scene stories!