5. The Dark Defender

Complete story — includes the ending

Dexter discovers that one of the men who murdered his mother in front of him as a boy is still alive. He dreams that a comic-book hero based on the Bay Harbor Butcher saves his mother, and is encouraged by Lila to seek closure by confronting his mother's killer, Santos Jimenez ( Tony Amendola ). Doakes and LaGuerta investigate a homicide in a comic-book store, and reminisce about their days as partners. Rita's mother warns Dexter to leave Rita and her children alone. Debra begins to lose faith in her relationship with Gabriel, suspecting that he is taking advantage of her.