Ya start off the game with a soldier breaking you out of prison so you can help fight monsters called locusts. These locusts are tryin' to take over the world and its up to you to stop them. The world is huge and set in the future. When your squad leader gets killed the main character named Marcus Feniz becomes the squad leader and you'll lead 3 other guys in your squad.
The gameplay is really simple, and the A.I. in this game is smart. When you shoot at the locusts, they'll hide just like a human player would.