He was portrayed by Scott Glenn in the 1987 film adaptation and by Denzel Washington in 2004 movie.
Creasy in the 1987 film, as portrayed by Scott Glenn.used much of the book's dialogue and didn't describe Creasy's life as much, only clueing the audience into the fact that he killed a lot of people and is traumatized for that. The film renamed Pinta to "Lupita" because Pinta translates to "whore" in Mexican slang. The film was also relocated to Mexico, as Central America is the site of most political kidnappings today. The film also introduced the aspect that Creasy should be struggling with his faith and be very religious, despite his brutal methods of torture and murder; as suggested by Denzel Washington. In the film, Creasy also gets shot about five times, and dies of his injuries at the end of the film, although he gives his life to save Pita's.
Although he did not like the more artistic tone of the 1987 adaptation, Quinnell gave the 2004 film a favorable review.
After years of dirty work as a Marine and later an assassin for the CIA (revealed in his resume to be ex-CIA(SAD/SOG) Paramilitary operations officer and former U.S. Marine Corps Force Reconnaissance special forces officer), John Creasy is burned out and pretty much dead on the inside and is a hard drinking alcoholic to numb the painful memories of all the people he killed in his lifetime. However, when he accepts a job from his old friend Paul Rayburn, he gets a chance at redemption. He is also covered in scars from unknown causes. There is a deep gash in his left eyebrow and numerous welts on his knuckles. It is never explicitly revealed why he has these scars, which is part of what adds to his tragic backstory.
In Mexico City, there is a wave of kidnappings happening where children of wealthy families are being taken and held for large ransoms. The man behind them is simply known as “The Voice”, who has a web of corrupt officials and goons working for him. The wealthy automobile manufacturer, the Ramos family, hires Creasy to be the bodyguard for their daughter Lupita, who they call "Pita". Creasy gets drunk one night, and particularly distraught, attempts to shoot himself with his Glock 34 to the music of Linda Ronstadt. However, the bullet fails to fire, presumably as a result of a bad primer. Creasy goes out onto the patio in the rain and calls Rayburn, who tells him that "a bullet always tells the truth", implying that God intended for Creasy to live for some reason. Creasy saves the bullet but gets pestered by the precocious child, who he barely tolerates. Although he could care less, Pita’s big heart eventually wins him over and the two become close friends. Creasy gives up drinking and Pita becomes the daughter he never had, mentoring her with her swim lessons and taking her out to lunch with Rayburn.
Creasy gets into a fierce shootout with Pita's kidnappers.One day after dropping Pita off to her piano lessons, Creasy sees a suspicious looking car circling around the block as well as a pair of police cars blocking one end of the street. As Pita leaves the piano teacher’s house, Creasy fires a shot and tells her to run and a firefight breaks out. Creasy manages to kill four of the kidnappers but is shot multiple times and Pita is taken. The Voice demands million for Pita’s return and Samuel Ramos delivers the money to the designated spot. The Voice’s men are ambushed however and he calls back to say that Pita is dead. Creasy hears this and after healing up, vows to kill everyone involved.
Creasy buys a small arsenal of weapons from an illegal gun dealer and starts to brutally take out corrupt police officers and officials. He tracks one down based on the license plate number and the shot up windshield and tapes him to the steering wheel. They then drive to an isolated junkyard and Creasy asks him questions about the kidnapping ring. When the man refuses to answer, Creasy begins to cut the man's fingers off, using a cigarette lighter to cauterize them. He then cuts off his ear and shoots him in the head, pushing the car off a cliff and causing it to explode. He then uses a sawn-off shotgun to break into a Rave and kill all the kidnappers that live there, burning the place down in the process. He then carves a path of destruction through Mexico City as he makes his way to the top of the kidnapping ring. He uses a Chinese RPG rocket launcher to take out a motorcade and then kidnap the president of La Hermenadad, a brotherhood of corrupt cops that ambushed the Voice's men, who he then kills by jamming a stick of dynamite up his rectum, but not before learning that the kidnapping was actually set up by Samuel Ramos and his lawyer Jordan Kalfus in order to get insurance money as Ramos was going bankrupt. Creasy goes to Kalfus ' residence only to find him shot dead in his pool. He then goes to the Ramos residence where he forces Samuel to confess to his wife Lisa about his role in the kidnapping, during which Samuel admits that he killed Kalfus after the latter double-crossed him by stealing the money prepared for the ransom. Creasy then gives Samuel a Glock 17 with only the bullet he earlier tried to use to kill himself, and encourages Samuel to take his own life, which he does. Creasy then gets the last piece of the kidnapping puzzle as he learns that the Voice is Daniel Sanchez. Creasy breaks into Sanchez’s brother’s house and tortures him by shooting off his fingers with the shotgun as he calls Sanchez. Sanchez reveals that Pita is still alive and that he will trade Pita for Creasy and his brother. Creasy and Lisa Ramos drive to the meeting spot and the exchange takes place, where he says goodbye to Pita. Inside the car, Creasy succumbs to his repeated gunshot wounds he received earlier, at peace with himself and die for his wounds. Sanchez is later shot dead at his home by Detective Manzano, who had been following and helping Creasy.