Smallville :

Lois' younger sister, Lucy (guest star Peyton List), with whom Lois doesn't get along, visits Smallville and charms everyone she meets. However, Clark discovers a darker side to Lucy after he catches her stealing money from a bar to pay off a European crime syndicate.

Clark forces Lucy to reveal the truth about her sudden appearance in town, a truth that puts Lois in grave danger. Meanwhile, the crystal disappears from Lana's apartment, and Jason accuses Lionel of stealing it.