Clark was sent from Krypton as a child. Jor-El never told his wife, Lara Lor-Van, but as with all unmanned ships, there was a risk of failure. Anything could go wrong, after all. He never told her that he'd sent two ships.

One had Kal-El, their son.

The other, sent just a little bit after, held the clone of Kal-El.

Jor-El's reasoning was simple; Kryptonians were about to be an endangered species. He needed to make sure that at least a clone of their child made it, for the sake of preventing their species from completely dying out.

Was it immoral?

Yes.

Did he have the luxury to acknowledge that?

No.

If one ship failed, then the other would make it. One way or another, a Kryptonian would escape and live on. If he'd had time, he would have made more than one clone, but as it stood he'd only been able to make the one.

The readings from it were...odd. There was a possibility that the clone would be incapable of many natural Kryptonian abilities. But the clone was 100% Kryptonian, genetic anomaly or no. And Jor-El was at the point where he'd take what he could get.

~~~~~~

Kal's ship landed in a field, where he was picked up by farmers. Kal was raised in a loving, caring household and, with time, was able to learn about his Kryptonian heritage.

The clone's ship landed in the woods, hidden from the world, with such force that the ship was essentially destroyed. The clone was picked up by a man who thrived on isolation, who lived in a cabin, and who had an unnatural fear of ponies. Thus the clone's sense of priorities were...off.

The clone was named Jack Fenton, and as he would never come into his powers beyond super strength, he would also never know his Kryptonian heritage.

~~~~~~

Years later, Danny Fenton and Jazz Fenton are on a school field trip to the Hall of Justice, and the massive security system privately alerts the heroes on monitor duty of something it considers just a little important.

Naturally, this causes a lot of confusion.

Idea.

A pair of married Cryptid Hunters are tracking Bigfoot through the wilderness when they come across baby Jack.

They decide to adopt Jack.

Everyone in the family can tell that Jack isn’t human but don’t know what he is. Everyone has their own theory of what Jack could be and no one can agree on his species.

After a myriad of benign tests to ensure that Jack isn’t a changeling or a baby Bigfoot (he could grow into his fur Gerald!), the Fenton family decide to raise him as human.

However, it does become a reoccurring “joke” for various Fenton relatives to trick Jack into interacting with things their individual species theory says Jack would be weakened to. Jazz and Danny are also included in the “joke”.

Danny could not tell you how many times his relatives have been disappointed when he uses a cold iron spoon to eat Aunt Miriam’s famous holy water and wolfsbane soup.

Oddly enough this treatment has given Danny a high resistance to things that ghosts are traditionally weak to via exposure therapy.

The only reason Danny was never exposed to Blood Blossoms and built up a tolerance to that was because Uncle Louie used the last of the Fenton reserves a decade before Danny was born to make sure Jack wasn’t a ghoul.

Coming from the other end with Clark would this not mess with Lex so much. He knows Clark has to be Superman then this happens.

Look everyone we found my biological fraternal twin brother who was also adopted! I never knew he existed as like me he was a closed adoption. They even left him in a different state from me. Here are my niblings and his lovely wife. Look our kids get along great! Why yes he sure is not allergic to that one rare alien mineral. He and his wife are scientists and built a portal to punch a hole into another dimension. They are working on green energy.

Meanwhile Batman with Oracle's help has created a false set of paperworks for Jack as unlike the Kent's the Fenton's never bothered to even try to hide that they just found a baby. Nope just showed up in town the next time with a baby. Where did they get that baby? It just was wondering in the woods. Well if their parents come back for them we will point them to you. What are they going to do track down a mystery baby that showed up how long ago in the middle of nowhere? It is too late anyway they have bonded with the fenton's. They might be weird but an't nothing hurting a fenton kid.