The kid (alien) was sent by his race to conquer the planet, like the Viltrumites in Invincible. The ship activated his genetic programming when he came of age.
In many alternate Superman-esque stories, and in one arc of canon Superman, the alien race doesn’t look like humans. The ship Kal-El was sent in altered his DNA to make him resemble whatever species found him. I’ve always liked that take better. It’s probably the same for Brightburn, but never shown.
The kid (alien) was sent by his race to conquer the planet, like the Viltrumites in Invincible. The ship activated his genetic programming when he came of age.
In many alternate Superman-esque stories, and in one arc of canon Superman, the alien race doesn’t look like humans. The ship Kal-El was sent in altered his DNA to make him resemble whatever species found him. I’ve always liked that take better. It’s probably the same for Brightburn, but never shown.