From Coax’s Sept. 11 spoilers:
2.7 will see a middle-aged woman named Rebecca Dunlevy claim that she is Clark’s biological mother. She makes the Kents nervous, if only because she threatens to attract scrutiny to the strange circumstances under which Kal-El was adopted by puny humans.
The really weird part is who Rebecca thinks is Clark’s biological father. (Hint: His face is a familiar one to all “Smallville” fans.)
Lana, meanwhile, meets a former love of her mother’s, a married, Luthor-hating attorney named Henry Small. Lana comes to believe Small might be her true biological father. (2.7, aptly, is titled “Lineage.”)
Pete Ross, who will learn of Clark’s extraterrestrial origins early in the season, will help the boy of steel sneak into a Metropolis medical facility to engineer a DNA swap (if you know what I mean). Clark will demonstrate during the mission that he’s getting awfully handy with the heat-vision.
What does TV Guide say about tonight’s installment?
A strange woman arrives in Smallville and tells Clark that she's his biological mother and informs Lex that Lionel is the father. And she wants Clark to take a DNA test to confirm her story. Meanwhile, Lana decides to meet the man who could be her biological father.