Throwing stuff at a wall for Ep10. Or theory, I guess.
Lex and the Eradicator fight in their mindscape, trying to gain control over the other. The main group + the Task Force X people are at a high risk of dying. Clark gets his powers back somehow, frees Bizarro from the Brainiac mind control and they come back just in time to help. Unfortunately, the Eradicator still overwhelms the supers, but Lex comes in clutch and momentarily gains control of the Eradicator, giving them just enough time to land a big hit that severely weakens him.
Eradicator regains control, but is weak enough for the main group to fight back and beat it. Lex, however didn't leave that mental battle completely okay. The Eradicator beams his funky mind powers into Lex's brain and fully sets him on the evil side. No more morally questionable Lex.
The kids "die", but not actually for reals dead, but they actually return to the future. However it is now.
Also Clark and Lois gets a huge kiss at the finale. Because of course. And they deserve it.
Jimmy bawls his eyes out.