It is a period of civil war. Rebel soldiers, striking from a hidden base, have won their first victory against the evil German Empire. During the battle, rebel spies managed to steal secret plans to the Kaiser's ultimate weapon, the “Submarine Land Dreadnought,” a mobile Steam powered Land Dreadnought with enough power to destroy an entire city. Pursued by the Kaiser's sinister agents, Lady Catherine races home aboard her Steam yacht, custodian of the stolen plans that can save her people and restore honor to Germany....