Debra is downhill in her life, drinking too much. She is arrested for D.U.I. and calls Quinn in the middle of the night to release her without being charged. Meanwhile Dexter and Dr. Vogel try to find who might be threatening her and Dexter investigates her former patient Ron Galuzzo. The serial-killer sends two pieces of Sussman's brain, one for Dr. Vogel and the other for him. Dr. Vogel is intrigued with Dexter, who is consumed for loving Debra, and offers to help her, but Dexter tells that he can fix his problem since he is Debra's problem. He has dinner with his sister but Debra feels consumed by guilty for killing LaGuerta and she goes to the Miami Metro to confess her murder. However Quinn summons Dexter and he takes Debra home with Dr. Vogel that will treat her. Dexter discovers that Galuzzo is not the killer that is threatening Dr. Vogel but he has a dark secret.
"What's Eating Dexter Morgan?" is a good episode where either Dexter or Debra is consumed by different reasons. Dexter is consumed by his love for Debra and he believes that he consumes those who love him. Debra is consumed by the guilty for killing LaGuerta. Fortunately for them Quinn interprets Debra's confession as a guilty situation. My vote is eight.
Title (Brazil): "O Que Está Consumindo Dexter Morgan?" ("What's Consuming Dexter Morgan?")