The robotic visitor

Once upon a time there was a good robot from another world that came to visit earth. At first everyone was scared of him but after a while they got to know him. He even played with the local children he even helped the local police and museum. He moved from town to town all the robot needed was oil and a charger. He really enjoyed earth but he knew that one day he would have to leave earth. When that day come he said goodbye to earth and everything on it and returned to the world of robots called Roboworld.