"Now I've often said "good news" when sending you on a mission of extreme danger; so when I say this anomaly is dangerous, you can imagine how dangerous I really think it is."
In the year 2018 a massive comet was approaching Earth and, as the world watched, suddenly broke into two pieces and impacted into Baghdad and Tokyo. Before anyone could begin disaster recovery each site was encased in massive energy domes that made any attempt at surveillance and analysis impossible. In order to determine what happened the Fourteenth Platoon is scrambled to investigate. Within minutes of approaching the dome it quickly becomes apparent the Earth has been invaded by aliens. Aliens who are hostile. Aliens who like to build towers.