- "You dirty, little.... f**king prick!"
- ― King's last words to Eggsy before his death.
Chester King, also known by his codename Arthur, was the head of the Kingsman agency from an unknown point in time prior to 1997 until 2014. However, he also was a supporting antagonist in the film Kingsman: The Secret Service because he had betrayed Kingsman, as in league with infamous philanthrope Richmond Valentine he helped in his plot to wipe out most of the human race and establish a new world order.
Chester King was portrayed by famous British actor and producer Michael Caine.
Recruiting for the new Lancelot
Years following the death of fellow agent Lee Unwin, his former partner Harry Hart decides to enlist Lee's son Gary "Eggsy" Unwin (the protagonist of the franchise) to the agency, due to Harry's gratitude towards Lee for saving his life during their last mission at the Middle East. Also, King and the other agents of Kingsman recruit several candidates to fill the positon. King personally recruits Charlie Hesketh.
During the training of Eggsy and the other candidates, King assigns Eggsy a test: he has to shoot his pet dog JB in order to pass and become the new 'Lancelot'. However, Eggsy refuses to kill his dog (being unaware that the gun only hold blanks), resulting him to fail and a girl named Roxanne to become the new 'Lancelot'.
Betraying His Agency
When the Kingsmen interrogate Professor James Arnold following his escape from several kidnappers (led by the assassin Gazelle) a microchip implanted on Arnold's neck is sent a signal and detonates, killing him. The Kingsmen trace the signal to a facility owned by Richmond Valentine, who has recently offered everyone in the world his invention: SIM cards that grant free lifetime calling and Internet connections. Meeting up with the businessman, Harry tracks down to a hate group's church, where Valentine triggers the SIM cards to make the attendants go violent, causing a massacre which nearly killed everyone while Harry ends up being shot in the eye by Valentine.
Determined to avenge his mentor, Eggsy returns to the Kingsmen headquarters to convince King to let him get revenge on Valentine. However, just as King offers a brandy to Eggsy, the latter soon notices that King has a scar on his neck in the same location that Arnold had. This made Eggsy realize that King is actually in league with Valentine and that he set off the microchip that killed Arnold in the first place. Eggsy also realized that King has tipped off Hart's location to Valentine and that he has put poison on his brandy glass in an attempt to kill him to cover his tracks.
Outraged by King's treachery against his very own agency, Eggsy slyly switches the drinks, causing King to poison himself by accident. Just as King succumbs to the poison, he reveals to Eggsy that Valentine plans to cull the human race by transmitting his "neurological wave" worldwide via satellite network in the next few hours, believing this will avert the extinction of the human race to bring in a new world order. King then calls Eggsy a 'dirty little fucking prick' before finally succumbing to his death by the poison. His position as Arthur would later be taken by Sir Giles following the deaths of Valentine and his forces.
It was later revealed in Kingsman: The Golden Circle that Hart actually survived being shot by Valentine (despite having lost his eye in the process) as he and Eggsy attempt to foil a plot (formulated by Poppy Adams) that involves taking down the Kingsman Agency and controlling the worldwide drug economy.
- Richmond Valentine - Enemy, turned Ally