Dr. Vogel continues to treat Debra and they visit the container where LaGuerta died. Then Dr. Vogel shows the footage with Harry to Debra and explains her that she shot LaGuerta to protect Dexter; if she had shot Dexter, she would be feeling worse. Meanwhile Dexter investigates her former patient A.J. Yates and he notes that he has a scar on his head. Dexter meets Dr. Vogel and she tells to him that the cableman Yates was submitted to a brain surgery. Dexter breaks into Yates's house with Dr. Vogel and finds that the guy is a hacker and had accessed her files. Among them, Dexter finds one showing that he is an experiment to Dr. Vogel and he breaks with her. Quinn passes his exams to Sergeant but Matthews prefers Detective Angie Miller for the position. Debra seems to accept her situation but she snoops around Dr. Vogel's apartment and finds another footage of Harry that was made a couple of days before he commits suicide. Debra goes to Miami Metro and summons Dexter to go with her to a private place to talk. Dexter is surprised by the unexpected attitude of his unbalanced stepsister while driving.
"Scar Tissue" shows that Dr. Vogel, who seemed to be someone that wanted to help Dexter, is actually using him in another experiment. Dexter is different from the other seasons due to Debra and now Dr. Vogel is messing with his mind. Debra is totally unbalanced and has become a threat to Dexter. What is the real agenda of Dr. Vogel? My vote is eight.
Title (Brazil): "Cicatrizes" ("Scars")