Trapped in their great grandfathers museum and visited by the restless ghosts of warriors past, Arthur and Finn must travel back in time and rewrite history to set the ghosts free. Will the boys put a stop to the powerful warlord Kenji Kuroda seizing power once and for all? Discover the ways of the Japanese samurai and find out if Arthur and Finn have what it takes to overpower some of the most ferocious warriors on the planet in order to make it home alive.