Some may not be aware that Rambo is based on a series of novels by the author, David Morrell. While Morrell has expressed his enjoyment of some films in the franchise, in particular 2008’s Rambo, he has also been critical of the film adaptations. Most recently, David Morrell has said stated that he absolutely despised 2019’s Rambo: Last Blood, a sentiment that was shared by critics and fans alike.