Earth has fallen, and the last remaining ships make their attempted escape. As a member of the Sentry Defense Program, you have been woken from stasis to protect the precious human cargo as your vessel flees across space.

Your ship is under siege from a near-insurmountable alien foe. You must choose where to make a stand in a dynamic campaign with the enemy attacking in varying strengths across different ship subsystems. Will you decide to destroy a smaller force, preventing them from seizing a crucial subsystem? Or risk facing overwhelming odds thwarting a larger enemy thrust, blunting their main advance?