American Comics: I'm Iron Man's Younger Brother, and Also Superman

Leon transmigrated to the Marvel Universe, where Howard Stark adopted him and he became Tony's younger brother.

On his eighteenth birthday, he awakened a Kryptonian physique and the ability to travel through time and space. From then on, he grew stronger at a tremendous pace.

Tony: “Good grief, you can get stronger just by sunbathing, and now you want to learn magic too?”

Whoa!

What's this?

Chinese kung fu that grows a planet inside your body?

Superman: “We're both Kryptonians, but I can't help feeling like I've always lived in Leon's shadow!”

Batman: “Damn it!

I hadn't even fired a shot, and he'd already destroyed all my kryptonite!”

When the villains mass-produced kryptonite missiles and prepared to attack Leon, he flew beyond Earth, lifted the planet with one hand, and casually tossed it up and down.

“I'm still not strong enough. I need to find another world and go into seclusion for a while.”

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.