Clark's (Tom Welling) secret identity is at stake when a bad cop (guest star Cameron Dye) witnesses him use his superhuman powers and coerces Clark to join forces with him; however, when Clark double-crosses the cop, he is not prepared to deal with the consequences for him and his family. Meanwhile, Lex (Michael Rosenbaum) receives an intriguing proposal from an old British flame (guest star Kelly Brook, The Big Breakfast).