OK K.O.! Let's Be Heroes is set in the retro-futuristic year of 201X. The series follows the titular character, K.O., and his efforts to become the world's greatest hero while working at Gar's Bodega (run by Mr. Gar), a hero supply shop in Lakewood Plaza. Alongside him are his best friends and co-workers Radicles, a narcissistic alien, and Enid, a levelheaded big sister-like ninja, as well as other heroes who work in the area.