Thirst

S5, E5: Lana enrolls at Metropolis University at the last minute and is forced to join a sorority in order to get housing at such a late date. However, her new sorority sisters offer her more than a place to live after they turn her into a vampire and instruct her to kill Clark. Meanwhile, Chloe applies for an internship at The Daily Planet, but the newspaper's formidable editor, Pauline Kahn (Carrie Fisher - "Star Wars"), may be more then she can handle.