It is the year 1942, German troops have invaded Tibet and are searching for the lost city of ancient king Arjuna. It is rumored that here, in this mysterious place, twelve of Arjuna's mighty weapons are hidden. The legend has it, that each of these weapons is capable of destroying whole cities, leaving only ashes. One of those mighty artifacts alone, could enable the German Nazis to gain complete world domination. Arrogantly, the German troops did not expect to encounter any resistance but they suddenly did. This resistance is a mighty, powerful one and it has a name: Grom, Colonel Grom... and he has an old score to settle with his German archenemies!