You are a mercenary and serve at the space industrial base. It is not for military purposes, it is an ordinary factory for the production of some harmful chemicals. Your task is to protect equipment and personnel from any intrusion. So far, nothing serious has happened, but there were alarming bells and no one attached importance to them, but in vain. The trouble struck unexpectedly and attacked the base. The enemy turned out to be cruel and terrible, and also much higher in level of development. Evil huge monsters began a powerful capture and in a matter of hours almost the entire base became theirs. But you are not going to give up in Industrial Sky Base 3, but you will fight to the last.