WARNING! This post contains SPOILERS for The Gray Man.
The Gray Man introduces two of the CIA’s Sierra Six agents, leaving the identities of the other four nameless assassins a mystery. While Netflix’s The Gray Man is adapted from the 2009 book of the same name, the movie takes plenty of liberties in its story. Unlike the book, The Gray Man’s conflict begins when agent Sierra Six (Ryan Gosling) is ordered to kill Sierra Four, who gives him a drive containing incriminating information on CIA chief and main antagonist Denny Carmichael (Regé-Jean Page), which ultimately raises more questions about the assassin program than it answers.
The characters in The Gray Man reveal that the Sierra program was formed at the CIA under Donald Fitzroy (Billy Bob Thornton), who recruited hardened criminals and served as their case handler. Flashbacks to Six’s past confirm that the Sierra agents were given commuted prison sentences in exchange for a lifelong commitment to the CIA, which involved a complete erasure of their former identities. The Gray Man explains that the criteria for the Sierra agents involved their impressive skill sets, lack of family, and limited morality, all of which originally applied to the protagonist Six, whose real name is Court Gentry.
Related: The Gray Man's Biggest Unanswered Questions
The only two Sierra agents revealed in The Gray Man are Six and Four, the latter of whom dies during a fight with Ryan Gosling’s character. However, The Gray Man confirms that Six is now the last of the “dirty half dozen” after Four’s death, making it intriguing as to who the other agents were and what exactly happened to them. Mark Greaney’s Sierra Six book, which was published only a few months before The Gray Man’s Netflix
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