A bank teller discovers he is actually a background player in an open-world video game, and decides to become the hero of his own story. Now, in a world where there are no limits, he is determined to be the guy who saves his world his way before it's too late.

When an attack on the Kingsman headquarters takes place and a new villain rises, Eggsy and Merlin are forced to work together with the American agency known as the Statesman to save the world.