The agent Harry Hart from the Kingsman Secret Service helps the troublemaker Gary "Eggsy" Unwin, who is the son of an agent that saved the lives of Harry and his team sacrificing himself seventeen years ago. Harry invites Eggsy to be candidate to the vacancy of a new agent in the agency and he is trained by Agent Merlin and competes with other candidates. Meanwhile, the Kingsmen investigate the industrialist Valentine, who is an insane genius of technology that is plotting a deadly plan with his assistant Gazelle to save Earth from global warming eliminating most of the population with a chip and saving only those that he has chosen.