Expendable takes place in a distant future where an alien race has invaded human planets, starting with Novocastria. The game follows the story of the Millennium Soldier as he leads the human fightback against the alien threat.
The gameplay is fast-paced and action-packed, focusing on reflex shooting rather than strategic planning. Players must navigate through 20 levels of 3rd person 3D action, fighting off hordes of enemies and collecting power-ups to upgrade their weaponry. With 18 different guns to collect, including pulse cannons, particle accelerators, and rockets, players will need to stay on their toes to succeed. The game also features two-player cooperative and deathmatch modes for added multiplayer fun.