Clark (Tom Welling) goes into hiding after he discovers a startling new power that quickly gets out of control and accidentally harms Lana (Kristin Kreuk). However, after a hot new teacher (guest star Krista Allen) uses kryptonite-enhanced pheromones to convince Lex (Michael Rosenbaum) to marry her, then spellbinds Jonathan (John Schneider), Clark must get a grip on his new power in time to keep Jonathan from killing Lex.