This is a new variation of Clark's time on New Krypton that I don't think has been done before.
What if Clark had come back from New Krypton leading on invasion of Earth? Had his time on New Krypton changed him so vastly that the values he learned on Earth eroded away? Did Ching and Zara unintentionally warp him? Or is something far more sinister going on?
More importantly can Lois find out what's going on before Earth is in shambles/destoryed and it's people subjected to ruthless Kryptonian rule?
