Smallville: Season 4, Episode 11

4 - 11: Unsafe

Claiming to be cured, Alicia is released from Belle Reve hospital and comes to Smallville to rekindle her relationship with Clark. Initially skeptical of Alicia, Clark finds himself enjoying a relationship with someone who knows his secret, but when she pushes for more he hesitiates, causing her to use red kryptonite on him. "Bad Clark" emerges and whisks Alicia off to get married in Las Vegas. Meanwhile, Lana decides to have sex with Jason in order to win him back...