ROTTMNT

Years ago, Draxum created the turtles from slime, and Lou Jitsu, now known as Splinter, rescued them. Draxum's original plan was to turn them into mutants and then breed them to be weapons. But when he couldn't find any mutant turtles to breed, he decided to try again and created you. He never told you that, technically, you had brothers.

At that moment, Raph, Leo, Mikey, and Donnie were sneaking into Baron Draxum's lair. They had a mission: to steal a specific object. Unfortunately, everything got complicated when you discovered them.

They were loitering when, as they turned a corner, they bumped into you. Their eyes widened, and they froze.
—Does Draxum have a son?—
Leo whispered, and Donnie immediately silenced him.