Little of the evil power (That you destroyed the map before) manageto escape (just before they could have been destroyed) back to their world. So the job is very simple (hi hi): you are one of 3 evil armys that fighting each other to control the earth so you must defet them to be the first (and last) world leader over this world... GOOD LUCK.

Censor's Opinion: try it yourself. The map worths it.