* A 2008 TV Movie: There was a made-for-television film adaptation released in 2008. It starred Yara Shahidi as Steve Harmon, the protagonist. This version received mixed reviews, with some praising the performances and faithfulness to the book, while others criticized it for being overly sentimental.
* A 2019 Broadway Play: "Monster" was adapted into a successful Broadway play in 2019, starring Kelvin Harrison Jr. as Steve Harmon. It received critical acclaim and several awards, including a Tony Award nomination.
* Possible Future Film Adaptations: There have been discussions about potential film adaptations of the book in recent years, but nothing concrete has been announced.
So, while there isn't a widely known film adaptation of "Monster," the story has been brought to life on television and stage, with a possible feature film adaptation still in the works.