Col. John Arbuthnot

Colonel John Arbuthnot is a major protagonist in Agatha Christie's 1934 novel, Murder on the Orient Express, and its adaptations.
==Overview==
Colonel Arbuthnot is the best friend of the late Colonel Armstrong, who joined the assassination of Lefranco Cassetti on the Orient Express in order to avenge his friend, who committed suicided after losing his wife and children because of Daisy Armstrong's death. He is also revealed to be a lover of Mary Debenham, whom he eventually wed in some adaptations.
Whilst being a heroic character, Colonel Arbuthnot is comparatively the most antagonistic member of the killers in both the novel and some of the adaptations, much more so than Count Andrenyi who was merely aggressive. He even showed some anti-heroic traits in the 2010 film adaptation, where he attempted to kill off Poirot and Bouc to avoid arrest, but was stopped by others, who reminded him that they were not murderers. In the 2017 film, he also attacked Poirot in fury during the latter's investigation.
It made Colonel Arbuthnot initially the most aggresive passenger towards Poirot, but in all versions, he reconciled with the detective either after he discovered Arbuthnot's friendship with Colonel Armstrong, or after he spared all of the killers (in the 2010 film).
==Portrayals==
*In the 1974 film, he was portrayed by the late , who is known form being the first actor to portray James Bond, and also portrayed Henry Jones Sr. in Indiana Jones and the Last Crusade, John Patrick Mason in The Rock, Marko Ramius in The Hunt for Red October, and Draco in Dragonheart. In this version, he's going through a divorce from his first wife, citing her as the guilty party, after discovering that she had been cheating on him.
*In the 2001 film, he was portrayed by David Hunt. In this version, he's an American named Bob and is a software designer.
*In the 2010 film from Agatha Christie's Poirot, he was portrayed by David Morrissey.
*In the 2017 film, he was portrayed by Leslie Odom Jr..
==In the 2017 film (Dr. Arbuthnot)==
In the 2017 film adaptation, many of Colonel Arbuthnot's characteristics had changed drastically, especially his physical appearance, nationality, race and occupation. Here, he was an African-British physician known as Dr. Arbuthnot (a reference to Dr. Constantine, who was ommitted and combined with Colonel Arbuthnot in the 2017 film), instead of a Caucasian Englishman like that in the novel and other adaptations. This is the first version of Arbuthnot to be an African-American.
In this version, Dr. Arbuthnot was formerly a sniper who served under Colonel Armstrong in the war and had his medical school paid for by Armstrong. His personality and attitude was partially shaped by his self-consciousness about the stereotypical view of African-Americans in 1930s, and Bouc believed such stereotype would cause Dr. Arbuthnot to become a top suspect and took fall for the real murderer, had Poirot not find out the culprit.
==Trivia==
*In all of the adaptations thus far, only the 2010 adaptation has used Colonel Arbuthnot's first name in the novel, which was John. Other versions either changed it or completely ignored his first name.
*Arbuthnot and Colonel Armstrong are the same age.
*Arbuthnot only smokes a pipe.
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