Michael Ironside and Peyton List are back on "Smallville" as Lois' father and wild-child sister respectively. The General and Lucy Lane decide to drop in on Lois and Clark for a surprise Thanksgiving dinner. Clark and the General get off to a rocky start after Lois' father bashes the superheroes and tells Clark he is trying to pass a vigilante registration law.

Meanwhile, in an effort to stop the vigilante registration act from being passed, Rick Flagg (guest star Ted Whittall) lies to Lucy in order to lure Clark away from the farm long enough for him to assassinate the General. Lois is torn between making her father proud and her love for Clark.

The episode "Ambush" will air on November 5 at 8/7c, followed by a new episode of "Supernatural". In "Family Matters", Dean becomes suspicious of Samuel's motives, but Sam isn't sold on the idea that their grandfather is doing anything wrong. The brothers go along on a hunt with Samuel and the other Campbells, but things go terribly awry.