You control a team of 4 elite and unique squadron members:
Hawk, who has the ability to turn invisible and use a powerful melee attack; Flint, the sniper expert with the ability to auto target on enemies and cleans up with one shot kills; Tex, the heavy weapons expert who can also disarm mines; and Brutus, the only non-human member of the squad has a unique thermal vision and can regenerate energy over time.
Switch between all 4 squad members during play at a touch of a button in order to accomplish goals (using each members strength to get past an obstacle, be it many enemies, puzzles or long distance attacks). Each of the 18 missions has a new challenge and a range of human and alien enemies to overcome.
Multiplayer mode allows up to 8 people to fight as two teams of 4 against each other in a range of different play modes, and download new levels via Xbox Live support.