Clark takes in a dog with superpowers after Lois accidentally hits the pooch with her car. While looking for its owner, he discovers the dog was part of a LuthorCorp experiment and was being used to commit crimes. Elsewhere, Genevieve is revealed to be the person who helped free Lionel from prison.

Lois's younger sister, Lucy, arrives in town, and Clark learns that she has a shady past when he catches her stealing money from the Talon's register. Also, the ancient stone is taken from Lana's apartment, and Jason suspects Lionel.