A prisoner from the Phantom Zone appears on this side, which makes Clark go over there to check out what's going on. And shortly after he arrives, he finds out that it was all set up by no other than Zod. Clark was supposed to go there himself, but Oliver makes a quick move in the last second and they both end up in the Phantom Zone where they find several skulls marked with the Omega symbol.
Meanwhile, Lois finds out about the plan Clark and Tess made up just in case of trouble, and she doesn't like it so she decides to do something about that.
All in all not a bad episode. And the chance to see Callum Blue / Zod again. Forget about the bad reviews, this is not a bad episode, and keep in mind that the good stuff is coming right after this one.