You are a robot trying to defend a spaceship from invading aliens. At the start, alien slimes have taken control of the cargobay area of the spaceship and you have to minimise the damage they are causing.
The aliens find a way to take control of some of the robots turning them against you. You now have to fight against the aliens as well as parts of your own ship.
The spaceship is crashed on a nearby inhabited planet as the fight continues you have to find a way to stop the alien assault from spreading too far.