[s13e13] | Cure

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Lex provides a surprise assist to Clark, helping him locate the facility in time to save Chloe from having her heart harvested by Knox. Cast and Crew Director: Rick Rosenthal Writers: Al Septien and Turi Meyer [S13E13] Cure

Dean Cain, who famously played Clark Kent/Superman in the 90s series Lois & Clark: The New Adventures of Superman , appeared as the villainous Dr. Curtis Knox. Key Takeaways & Trivia Find details on other appearances in the DC universe

In a nod to his former role, Cain's character uses a handkerchief with the initials "C.K." in the opening scene. Cast and Crew Director: Rick Rosenthal Writers: Al

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It is discovered that Dr. Knox is actually an immortal serial killer who harvests organs from his patients to keep his ageless wife, Sophia, alive.