The only way to truly dominate the world is to do it without anyone noticing, hence not creating any stories at all. Doing it all using subterfuge, secrecy, and backstabbery would prove much more effective than, say, a robot army in the long run. Basically, if I were to use a gigantic army consisted out of ridiculously good armaments to conquer the Earth, sooner or later, rebels would rise up against me, and sooner or later, the rebels would find a way to thwart me.
But, if I were to find a way to secretly control the most powerful countries on the planet and/or the United Nations, there would be no danger of rebels, because there would be nothing to rebel against; Without a stupid or extremely radical change of policy, no-one would even notice I (or my secret Illuminatish organization) had been the puppet master in the shadows all along.