The mystery surrounding Chloe's death deepens as Clark and Lois investigate, discovering that Lex Luthor and Lois' abrasive and militarist father, U.S. Army General Sam Lane, are somehow involved. Meanwhile, Lana returns to Smallville after finding out that the symbol that appeared on her back in Paris is also on the cave wall. In prison, Lionel Luthor prepares for his murder trial and sends out a liquid-metal assassin to keep Clark and Lois from investigating Chloe's 'death'.

Lana tells Clark that she is moving to the Metropolis University and she is accepted in the Tri Psi Sorority, a sisterhood with hot vampires led by Buffy Sanders, and Lana is transformed in a vampire. Meanwhile, the chief-editor of The Daily Planet, Pauline Kahn, denies an intern position to Chloe, but in the end she proposes Chloe to write a good story to prove that she might be part of the team of reporters. Meanwhile, Lex intimidates Professor Milton Fine, but in retribution he shows a dossier about the secret experiments that Luthorcorp is performing in the campus of the Kansas University. When Clark sees Lana at Chloe's room, he believes she is with a hangover; later, he goes with Lana to a Halloween costume party promoted by the Tri Psi. When Lana attacks Chloe, Clark discloses the truth about Buffy and her sisterhood of vampires and tries to find a means to save Lana and Chloe when she gets bitten by the evil vamp Lana.

Tess devises a plan which will reveal Clark's true identity, while Davis comes up with a plan to ease the demon within him, but finds himself trying to scramble after Jimmy sees him kill someone.