Alien Invasion Fiction centers around a possession of Earth, such as Earth, a space station, a human colony, etc., being invaded by non-human extra terrestrials. Stories often explore initial response to the attack, regroup and fighting back, and/or post-invasion survival of humanity. Most scenarios presume military invasion, but this is but one possible form the invasion can take. Many of these stories have a hidden meaning, exploring parallel events in reality. Usually the aliens want to enslave mankind, supplant mankind, or eat mankind. Sometimes, they become mankind.
Half Life 2, Halo 2 and 3, Mass Effect (video games)
Navigate to Science Fiction