To deal with his stress, Dexter finds himself in Narcotics Anonymous (masking his "addiction" to killing as a drug habit). There, he meets Lila, his sponsor. Lila represents a dangerous path for Dexter—she is the only person who loves his "Dark Passenger" rather than his "Mask." Her obsession eventually turns from supportive to soul-destroying, acting as a cautionary tale of what happens when Dexter lets someone in too close. 3. Debra Morgan: The Emotional Anchor

Dexter is hunted by Sergeant Doakes while dealing with his new sponsor, Lila West.