Pyro is the name of two fictional characters appearing in American comic books published by Marvel Comics. Known as St. John Allerdyce, Pyro is depicted as a recurring enemy of the X-Men and later becomes an agent of the U.S. government. He was created by Chris Claremont and John Byrne and introduced in The Uncanny X-Men #141 (January 1981) as part of the Brotherhood of Evil Mutants.[1] Pyro has the mutant power to control fire. Pyro and the Brotherhood of Evil Mutants are the antagonists in the X-Men story Days of Future Past as they attempt to assassinate Senator Robert Kelly, which in an alternate timeline leads to a dystopic future where Mutants are hunted, killed or captured by the Sentinel robots. The assassination is thwarted, and at a later date the Brotherhood become agents of the US government in exchange for a full pardon, and the team becomes known as the Freedom Force. An Americanized version of Pyro named John Allerdyce appears in the X-Men film franchise produced by 20th Century Fox. He was portrayed by Alexander Burton in X-Men (2000), and was subsequently replaced by Aaron Stanford for its sequels X2 (2003), and X-Men: The Last Stand (2006). Stanford will reprise the role in the upcoming Marvel Studios film Deadpool & Wolverine (2024), set in the Marvel Cinematic Universe (MCU).