Chris Kent

Then Lois and Clark intervene and take the boy in.

Name him Chris Kent.

Well, it turns out he's actually Lor Zod, son of Zod and Ursa, and his abusive parents had sent him through the Phantom Zone to Earth to use his pod as this beacon to allow them and Nan, and then later many of the other Phantom Zone criminals, to break through to Earth, toss Superman into the Phantom Zone, Subjugate Earth, apprehend and incarcerate all of Earth's heroes.

Of course, with Mon-El's help, Superman is able to return.

And they're able to beat back the Phantom Zone criminals.

reverse the process and essentially pull them back into the zone.

And it's ultimately young Lorzad slash Chris Kent who allows himself to be pulled in to spare Superman, to go back in so that the portal will close before Clark can be pulled in.

So those are the broad strokes of this.