Originally Posted by
superduperman
I'd give him a slightly different origin. Change how Krypton was destroyed. Jor-El is a geologist who discovers some strange radiation at the planets core and when he probes deeper, he discovers there's a bomb left over from the Kandorian war at the center. He goes to the governing council to tell them what he's found but they dismiss him by saying a bomb that old couldn't still be active. Later he finds out the council knew about the bomb all along and built a ship to save themselves. The reason he detected the radiation is because it's about to blow. Knowing there is no way to deactivate the bomb or save the rest of the planet, he decides to steal the ship along with his brother Zor and their families. The ships system is already programmed for Earth because the council planned to go there and make themselves gods by killing off or enslaving humanity.
Just as the ship takes off, the governing council finds out and orders it shot out of the sky. Just as the ship leaves the atmosphere, Krypton's "world cannons" hit the star drive damaging it and causing it to blow up. Jor-El, in a panic, puts his son in an escape pod and sends it off, already pre-programmed for Earth. Along with records of his journals and a complete history of Krypton. Zor does the same for his daughter. Just as the parents get into their escape pods, the ship blows up. And then the planet not long after. Killing the council and everyone else.
Kal's ship crashes on Earth in the middle of the night, causing an electrical disruption knocking out all of Smallville's electricity. The Kents go into town the next day and on the way back, Martha sees smoke coming from the north forty. Jonathon runs out and finds the ship. Because the council wanted to take over Earth quickly, there are solar collectors inside the ship. A month later, Jonathon has buried the ship and Martha goes upstairs to wake little Clark from a nap when she finds him floating above his crib. She panics and runs and gets Jonathon. The official story they told everyone was that they literally found him on their doorstep. A couple years later, a two year old Clark lifts up a dresser to recover a lost toy car. As the years go by, Clark has to learn to control his "gifts". It takes most of his childhood to master flight. The vision powers don't come along until puberty. By the time he is eight, he can lift the tractor over his head. His parents are reluctant to let him go to school with other kids and almost take him out altogether when he gets into a fight in kindergarten and breaks a kid's arm.
Then, when Clark is seventeen, he is helping his father fix a tractor when he hears a little girl crying on the railroad tracks. Her leg is stuck. Clark sees a train coming and runs to help her. Getting there just as the train does, he shields her with his body, wrecking the train. Clark wants to know why he can do these things. The "found you on the doorstep" excuse isn't cutting it anymore. So Jonathon finally decides to show Clark the ship. That is when he finds his fathers journals and history and learns the truth of his identity. Clark goes off to college and travels the world reporting on various events. Often getting involved in dangerous situations and getting "lucky" to get out of them alive. But he's getting tired keeping his abilities a secret. Finally, after he gets a job at the Planet, he goes to report on a fire and notices that some people are trapped on a top floor and the department can't reach them. This is when he decides he must use his powers. So he flies up and rescues them. But because the fire burned off most of his clothes, no one recognized him. And he got out as quickly as he could.
The media wants to know who this mysterious man was that saved those people. Lois publishes a story calling him a "Super-Man". It is after that that Clark goes home and decides he can't hide anymore. That is when Martha decides to make him the suit. And the Superman is born! Luthor initially has no opinion of Superman until he stops one of his arms deals to a terrorist group (yes, in this universe, Luthor is largely a weapons manufacturer). Meanwhile, an alien presence that "collects" rare species sees the reports about the Superman on Earth and recognizes him instantly as a Kryptonian. So it comes to Earth to collect him. The creature, the last survivor of Colu, is a brain-like creature that collects cities and species from dying cultures. It tries to take Superman but he defeats it's probes so instead, it decides to take the entire city with him in it instead. Superman defeats the creature, saves the city, and finds the last survivors of Kandor in a globe. In an act of forgiveness for the destruction of his planet, Superman saves the Kandorians from the Coluan.
Throw in references to a proto-Batman Bruce Wayne watching the news about this new "Superman" in Metropolis, Someone finding a green glowing rock in Smallville, and Superman burying the ship in a cave in the arctic, and that would be my origin for Superman.