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.
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. [S13E13] Cure
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. The Martian Manhunter (John Jones) warns Clark that
Lana Lang begins monitoring Lex secretly through her Isis Foundation. Reception Knox is actually an immortal serial killer who
In a nod to his former role, Cain's character uses a handkerchief with the initials "C.K." in the opening scene.