As detailed in our review of "Patriot," the pieces of Smallville's final season puzzle are aligning.

And while the show takes this Friday off in honor of Thanksgiving, it will return in a major way on December 3: with an episode that features the return of John Glover as Lionel Luthor, along with a trip to an alternate universe.

The latter development will result from a Kryptonian box discovered by Tess. Once Clark accidentally activates it, he'll be taken to a parallel dimension where Lionel is the one who found him in the cornfields as a child.

What else is amiss about this place? Clark Luthor is a murderer and Lois is engaged to Oliver. Watch the preview above to see more of what's in store on "Luthor."

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.