Career slackers Scooby-Doo and Shaggy must put the "chi" in "munchie" to solve the ultimate martial-arts mystery! The Mystery Inc. crew travels the globe on a transcontinental treasure hunt to solve a series of ancient riddles. They're racing against the vengeful Black Samurai and his spectral Ghost Warriors to claim the ancient Sword of Fate, a blade fabled to possess amazing powers.
Along the way, Scooby-Doo and Shaggy are indoctrinated by an unlikely Sword Master who teaches them Bushido, the Way of the Samurai. Their emerging skills are quickly tested by an unstoppable army of Robot Ninjas. And in the end, our harried heroes discover that Bushido, emphasizing loyalty, honour and courage, holds the key to the mystery.