The film follows Gary “Eggsy” Unwin (Taron Egerton), a young man from a working-class background who gets recruited into a secret spy organization called Kingsman by Harry Hart (Colin Firth). Kingsman is an independent, international intelligence agency operating at the highest level of discretion.
Eggsy, along with other recruits, undergoes rigorous training and a series of tests to become the next Kingsman agent. Meanwhile, tech billionaire Richmond Valentine (Samuel L. Jackson) plans to unleash a global threat by using SIM cards to induce aggressive behavior in people.
In the climax, Eggsy, now a fully trained Kingsman agent, infiltrates Valentine’s secret mountain base. He faces off against Valentine’s henchwoman, Gazelle (Sofia Boutella), who has razor-sharp prosthetic legs. Harry, who was presumed dead earlier in the film, returns to assist Eggsy.
The climax involves a stylish and intense sequence as Eggsy confronts Valentine, who activates his plan to broadcast the aggression-inducing signal. Eggsy, with the help of Harry and his fellow Kingsman agents, manages to thwart Valentine’s plan and save the world.
The film concludes with Eggsy becoming the newest member of Kingsman, and he adopts the codename “Galahad” in honor of Harry, who sacrifices himself to save Eggsy during the mission.
“Kingsman: The Secret Service” received acclaim for its stylish action sequences, humor, and subversion of spy movie tropes. It spawned a successful franchise, with sequels exploring the world of the Kingsman organization.