"Cure" was generally well-received for its darker tone and for utilizing the "meteor freak of the week" formula in a more character-driven way. Critics appreciated the tension between Clark and Chloe, as well as the surprise assistance from Lex. If you'd like to explore more about this episode, I can:
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
Lana Lang begins monitoring Lex secretly through her Isis Foundation. Reception "Cure" was generally well-received for its darker tone
The episode reveals Dr. Knox is centuries old, having previously gone by names including Jack the Ripper. Curtis Knox
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.
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.
Chloe Sullivan (Allison Mack) learns about Dr. Curtis Knox (guest star Dean Cain), who claims to have a surgical procedure that removes meteor powers, effectively "curing" the infected. Desperate to live a normal life with Jimmy Olsen, she schedules an appointment.