After falling through the ice and nearly drowning, a teen finds that he cannot keep himself warm without extracting heat from an outside source---mainly other people. Meanwhile, Lex persuades Clark to ask Lana out on a platonic date.

An overweight teen becomes excessively thin after eating vegetables tainted with kryptonite, but she also develops a voracious appetite for food---including human flesh. Meanwhile, Clark ponders what to get Lana for her birthday; Whitney gets a tryout for a college football team; and Lex learns some disturbing news about his health.