20 films that took the longest to finish

10. Alita: Battle Angel

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Alita: Battle Angel is based on a manga by Yukito Kishiro; it was in development for more than a decade. In 2003, James Cameron said he would love to make the film, but he already was busy with the Dark Angel series. In 2005, Cameron was too busy with the making of Avatar. As the director kept getting distracted by other projects, he decided to let director Robert Rodriguez take the film, and shooting began in 2016. The film released in 2019.

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