In a Texas border town, car salesman Charlie moonlights as a masked Lucha libre wrestler going by the name "Green Ghost."
When assailants arrive seeking an otherworldly emerald, Charlie discovers that he has super powers.
As he learns to fight from the unconventional Master Gin, Charlie is told that he's part of a secret warrior "triad of light" with his childhood friend Marco and Marco's sister led by La Nana.
Together, they've been chosen to protect humanity from Drake, the embodiment of the Mayan apocalypse.
As a stargate is opened in a Mexican pyramid, Drake seeks the power to destroy humankind - and Charlie, linked to the power of the emerald, is the only one who can stop him.
Charlie must harness both his physical and mystical strength to save humanity and go from Gringo to Green Ghost.