Clark (Tom Welling) is forced to use his powers in front of Alicia (Sarah Carter, Black Sash), a new girl at school, but he is surprised to find out she has powers of her own. The two develop a bond through their shared secret, but things turn ugly after Alicia becomes obsessive about sharing Clark with anyone else - especially Lana (Kristin Kreuk). Meanwhile, Lana asks Lex (Michael Rosenbaum) to investigate Adam (guest star Ian Somerhalder).