Genghis Khan is the leader of the Mongolians in Civilization I. Total Threat Level: 6 Musical Theme Inspiration: unnamed original composition While many rate Gandhi as the most dangerous leader in Civilization I, regular players finding a grey city nearby would rather encounter him than Genghis Khan. As with the real Mongol empire, Genghis is able to expand his nation at a faster rate than any other NPC, and favours military science, which gives him a crucial early advantage. If there had been memes in the early 90s, this guy would have been the star of them.