Actually I played a game this summer. It's really a cool setting. The basic idea is that the world's energy problems were solved by the use of a very alternative power, which, unfortunately, is something along the line of transdimensional flux gates (or something like that). And we all know what happens once you start dabbling with that. Scientists have a tendency to go mad and together with the raw power you can get from these gates, you can also get - um - unexpected visitors. Also with unlimited energy supply, mankind started to go space exploring resulting in a meeting with a strange civilization called Mee-Go, who have nothing better to do than start an invasion on Earth. Well, it was really fun to play.