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Kingsman: The Secret Service
In 1997, probationary secret agent Lee Unwin sacrifices himself during a mission in the Middle East to save his superior, Harry Hart. Feeling responsible for Lee's death, Harry gives Lee's young son, Gary "Eggsy" Unwin, a medal engraved with an emergency assistance number. Seventeen years later, Eggsy is arrested for stealing a car belonging to a friend of Eggsy's abusive stepfather, Dean. After calling the number, Harry arranges Eggy's release and violently confronts Dean and his gang. Harry later reveals to Eggsy that he is a member of Kingsman, a secret independent intelligence agency, and nominates Eggsy to join the agency to replace "Lancelot", an agent recently killed by the assassin Gazelle while trying to rescue climate change professor James Arnold from kidnappers.
While Eggsy undergoes Kingsman training under the supervision of Kingsman technical support operative "Merlin", Harry interrogates James at Imperial College London after he is mysteriously returned unharmed by his kidnappers. When Harry attempts to question him, a microchip implanted in Arnold's neck explodes, killing him and putting Harry in a coma. The chip's signal is traced to billionaire philanthropist Richmond Valentine, who has recently distributed free SIM cards worldwide. Harry, after recovering from his coma, poses as a philanthropist to meet Valentine; Kingsman discover Valentine's close associates each have the same microchip implantation scar on their necks.
Eggsy forms a friendship with fellow recruit Roxy and survives a series of demanding tests. Eventually, only Eggsy and Roxy remain among the candidates. However, Eggsy fails the final test because he refuses to shoot the puppy he was previously tasked to raise; Roxy becomes the new "Lancelot", and it is revealed that the gun's bullets were blanks. Meanwhile, Harry discovers Valentine's connection to a religious hate group and travels to their church in Kentucky. Valentine activates a signal within the SIM-cards, which cause everyone in the church to become uncontrollably violent. Harry is forced to fight his way through the congregation and is the sole survivor, but Valentine later shoots him.
Back at Kingsman headquarters, Eggsy discovers that the agency's leader, Chester "Arthur" King, has a microchip implementation scar: Arthur reveals that the SIM-card signal will be launched to trigger global violence to drastically reduce the human population in order to combat climate change. Wealthy supporters and selected world leaders have been implanted with protective chips, and dissenters, including Crown Princess Tilde of Sweden, being imprisoned in Valentine's bunker. Eggsy leads Arthur to poison himself, and joins Merlin and Roxy to stop Valentine. Roxy destroys one of Valentine's satellites, and Eggsy poses as Arthur to infiltrate Valentine's bunker. He is soon discovered by failed Kingsman recruit Charlie Hesketh; Valentine secures a satellite replacement and launches the signal.
As global chaos erupts, Eggsy kills Gazelle while Merlin activates a failsafe in the implanted chips, causing the heads of Valentine's allies to explode; Eggsy then kills Valentine with one of Gazelle's prosthetic blades, ending the signal. In a mid-credits scene, Eggsy, the new "Galahad", offers his mother and younger half-sister a new home while he confronts Dean and his gang.