A superhero named Doug Martin comes to the rescue with the aid of Officer Mappy, when a threat from a subterranean underground civilization led by the cat-like Gorgo in a plan to use the powerful energy source located inside Ki to destroy the regular world and merge it with his world so he could rule it for himself. But in the underground world, Doug and Mappy come across the knight Gil, who has been sent to save Ki from Gorgo and his goons.
