Danger Unlimited — Osamu Tezuka

In 1960, four heroes fought to save the world. In 2060, who will fight to reclaim it? A freak accident gave four friends strength and abilities that set them apart from normal men, and they used these abilities to fight the tide of evil as Danger Unlimited! Fast forward to the far-flung future, when the never-ending battle is actually nearing its end and the side of justice is losing; earth has been conquered by an alien race and super-powered humans have been outlawed. The human race needs some help, some heavy-duty firepower, if it's going to turn the tide and take back earth. It needs another Danger Unlimited.