Clark (Tom Welling) must stop a kryptonite-infected man (guest star Reynaldo Rosales) who seeks to relieve the suffering of the elderly and sick by turning them into ashes - and Whitney's (Eric Johnson) ailing father may be his next victim. Meanwhile, Lex (Michael Rosenbaum) is furious after his father sends someone to look into LuthorCorp's financial records and this man reveals Lex's secret investigation into Clark and his family.