Origin: The Kryptonian civilization once spanned hundreds of worlds, their technology and knowledge unrivaled in their corner of the galaxy. Kryptonians had long since advanced to a point where technology and biology were indistinguishable, making them virtually immortal and omnipotent in the eyes of less developed races. Over time they grew overconfident, and wished to introduce their technology to undeveloped worlds, in direct violation of the most important rule of the galactic community: the Omega Law.
In an attempt to assimilate the natives of the planet Mars, Krypton finally gained the attention of Colu, enforcer of the Omega Law, and was marked for extermination. A Kryptonian Scientist named Jor-El, specializing in passively and remotely observing nearby Earth, witnessed this and rapidly set a plan forward to save his infant son, Kal-El, from their fate. By sending him in a conventional rocket toward the backwater planet Earth, he guaranteed Kal-El's safety from Colu. The rocket took over a thousand years to reach the planet, and upon reaching the surface, restructured Kal-El's body so he would appear as a human.
Raised by simple farmers, Kal-El (now called Clark Kent) eventually learned of his heritage when examining a recorded message from his rocket. His father informed him of his fate, and that he must never dominate the planet with his immense power, as it would warp the fate of all life on Earth. Not content to passively observe humanity, though, Clark decides to inspire others through his actions as Superman.
Superman has declared that he fights for those who cannot defend themselves, owing no allegiance to a particular government (though still obeying their laws). He has particularly targeted corporate corruption and the military-industrial complex as enemies of human progress, his most prominent opponent being billionaire industrialist Lex Luther and his company, LexCorp.