Steam Slug is a third-person shooter where the whole world has become a toy in the hands of one professor. For more than ten years, a certain Dr. Strauss has been studying human habits, actions, and, in general, behavior in order to improve all aspects of human life and make it a more intelligent race, capable of surviving in any climate and in any trouble. To do this, he had to connect a still functioning human brain with a steam mechanism, and he was right. Thanks to this discovery, chaos came to the world, and the earth was enslaved by steam bots. In the first second, the scientist regrets what he did and asks the government to stop the production of these monsters, but the supreme ones reject the man's request, since these robots have firmly settled in the life of every person, and this brings in a good profit. Strauss, to spite everyone, conducts an experiment on himself and becomes the same robotic mechanism wanting an uprising.