Smallville: Season 5, Episode 5

5 - 5: Thirst

Lana decides to enroll at Metropolis University at the last minute and is forced to join a sorority to find housing at such a late date. However, her new sorority sisters offer her more than a place to crash 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 may be more then she can handle.