OH and by the way, even if you bring in Genki Dama, Spirit Bomb, Goku would have to charge forever! And remember the people have to willingly give up their power, so how would he contact the Earth? Ha. And even if you say SS4 Goku would own him, he's not even canon, because he wasn't made into Akira Toriyama official DB& DBZ sotryline. He only worked on the art. And haha, he couldn't even lift a building.
Haha, no way Goku would beat Superman. Goku doesn't move close to the speed of light, and Superman has escaped from black holes, and has held one in his hand. Goku has never done anything CLOSE to that! And don't say, "Goku can destroy the Universe with one finger", because you'd be a fanboy, and Goku has never shown to be anywhere CLOSE to doing that. Superman has moved the Earth and the whole Solar System in Silver Age. Superman has survived an atomic bomb and actually beat Imperiex, if you don't know who he is look him up. You guys are just being fanboys, do some research on Superman or shut your hole.