Dexter (episode)
Dexter is contacted by his foster sister Debra (Jennifer Carpenter), a vice officer in the Miami Metro Police Department. Dexter, a blood spatter analyst for the department, assists Debra in investigating an apparent serial killer targeting prostitutes. Dexter examines the latest victim and is shocked to find no trace of blood on the dismembered corpse. At the police station, Dexter discusses another murder case being handled by James Doakes (Erik King), a detective who dislikes him. Later, Dexter watches Jamie Jaworski, a murderer who escaped justice due to a faulty warrant, and breaks into his home to find evidence. Once he confirms that Jaworski is guilty, Dexter meets with his girlfriend Rita Bennett (Julie Benz), a former victim of domestic abuse victim; Rita has two young children, Astor and Cody. While on a date with Rita, Dexter finds another murder scene with no traces of blood, this time with the victim's head missing. Dexter theorizes that the killer murders his victims in extreme cold, explaining the absence of blood, and might be using a stolen refrigerated truck. Dexter allows Debra to pitch the theory, but their superior officer, Lt. María LaGuerta (Lauren Vélez), dismisses it.
Debra Morgan
Vogel tells Debra that she had no other choice but to protect Dexter, and shows her recorded interviews with Harry expressing his guilt over training Dexter to kill; in these interviews, Debra learns the truth about her father's death. She reaches out to Dexter, asking him to take a drive with her so they can talk. Once on the road, Debra seizes the steering wheel and plunges the car into the bay, intent on killing herself and her brother. She is rescued, however, and saves Dexter's life by swimming to the car and pulling him out. Debra goes to a resentful Dexter for help when Vogel is kidnapped. While the two of them track Vogel down, Debra tells Dexter that she had saved his life because she couldn't imagine hers without him in it. They find Vogel at the mercy of one of her former patients, serial killer A.J. Yates (Aaron McCusker); Dexter kills him to protect Debra. Dexter and Debra admit they need each other, and they reconcile.