After the scientist that made him died he wanted to venture further from his home. But seeing as he is part robot, he needs a consant energy stream feed. Well, being a robot he decided to make his own portable energy feed system.. Well it seemed to run well enough, but after a month it blew up! So he had to move back home before the energy reserves were depleated so he would not die. The biological components of his body require the machanical parts to keep working. That is why he is now home until he can build a better energy transmition unit!