Battleworld was a patchwork planet constructed by the Beyonder using pieces taken from hundreds of worlds, including Earth, formed as an arena for his "Secret Wars". Towards the end of this conflict, the Molecule Man transported the suburb of Denver which had been stolen from Earth back home. The Thing stayed on Battleworld for a while after most of the Beyonder's kidnap victims had returned home, coming into conflict with Ultron and his own dark side; when he departed, Battleworld blew up.