In the single player campaign you play John Armstrong, a young medical student drafted into the National Guard during a worldwide alien Invasion. During a critical mission, you team is wiped out and success depends on you. Explore a realistically modeled New York City in the aftermath of an alien Invasion. Fight against a wide variety of Invaders, from swarms of mindless Spawn to titanic Aspirants. Collect alien technology and exchange it for weapon upgrades. Team up with your friends to take on challenges impossible for a single player to defeat.