[s13e13] Cure May 2026

Lex Luthor hires Knox, believing his work is legitimate. He is unaware of the murderous side effects, making it another instance where Lex's pursuit of power blinds him to the morality of his partners.

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 [S13E13] Cure

In a nod to his former role, Cain's character uses a handkerchief with the initials "C.K." in the opening scene. Lex Luthor hires Knox, believing his work is legitimate

The episode reveals Dr. Knox is centuries old, having previously gone by names including Jack the Ripper. Curtis Knox

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

The Martian Manhunter (John Jones) warns Clark that Kara (Laura Vandervoort) cannot be trusted, revealing that her father, Zor-El, tried to kill Jor-El. Kara actively works against Clark to find her spaceship crystal.