User blog comment:Makotoviva/How does the Sonic TV show connect with the Sonic Games?/@comment-72.191.49.218-20111024012917/@comment-72.191.49.218-20111024013553

Robotnik created a machine to take him from his base in Robotropolis (which later gets a new part Eggmanland) and Earth, that's why Shadow has Sonic's physical appearance, to give Sonic (should he ever come to Earth, Robotnik could never get Shadow to Mobius) a bad name.