The player is flying as a character known as Reaper, number 4 in the Bone Arrow Squadron, 20 years after the catastrophic Ulysses Disaster. A terrorist organization has cropped up in the years following, and the United Nations is now utilizing mercenary forces to assist in their worldwide efforts to stop these terrorists.
Multi-player is a big aspect of Infinity. Players take part in "Online Co-Op Missions", a "competitive co-operative" gameplay mode in which players separate into two teams and aim to destroy the most targets. Players are fighting for themselves, their team, and the overall destruction of the enemies on the map.