You are a cat, who was accompanied by more cat friends, when you make a mistake and fall into a huge crater, unfortunately you never see your cat friends again, but as you explore further, you see that you have just discovered an underground walled city populated by robots, machines and mutant bacteria, trying to return to the surface, you discover a little robot that has lost its memory, he says he would help you return to the surface, but in return he would help release the wall, and the robots would be free