Dexter assists detectives Batista (David Zayas) and Doakes (Erik King) in investigating the murder of an officer who was working undercover investigating drug baron Carlos Guerrero (Rudolf Martin). Doakes becomes personally involved in the case, as he was having an affair with the officer's wife, who was also attacked.
Meanwhile, Debra discovers the refrigerated truck in which the Ice Truck Killer dismembers his victims. She is promoted by her superior, Lieutenant Maria LaGuerta (Lauren Vélez), to the Homicide Department. Inside the truck, Debra, Batista, and Dexter find a block of ice with five fingertips in it, left deliberately by the Ice Truck Killer.
- After the scene where Debra is transferred to homicide, Batista and LaGuerta have a short conversation in the kitchen in Spanish without subtitles. The rough translation of the scene is as follows:
- LaGuerta: How's Nina and your daughter?
- Batista: They're marvelous.
- LaGuerta: You know they need you too, eh?
- Batista: (Small nod, says nothing)
- LaGuerta: Angel, go home.
- Michael C. Hall as Dexter Morgan
- Julie Benz as Rita Bennett
- Jennifer Carpenter as Debra Morgan
- Erik King as James Doakes
- Lauren Vélez as Maria LaGuerta
- David Zayas as Angel Batista
- James Remar as Harry Morgan
Guest Starring Edit
- Geoff Pierson as Thomas Matthews
- Sam Trammell as Matt Chambers
- Rudolf Martin as Carlos Guerrero
- Cristos as Norberto Cervantes
- C.S. Lee as Vince Masuka
- Richard Gunn as Sean "The Mechanic"
- Lisa Kaminir as Prosecutor
- Christina Robinson as Astor Bennett
- Daniel Goldman as Cody Bennett
- Maureen Muldoon as Kara Simmons
- Devon Graye as Teenage Dexter
- Keith Pillow as Lawyer
- Brandon Morris as EMT
- Roger Hewlett as Mr. Pryce
- Alex Schemmer as Alexander Pryce
- Andrew Hawkes as Officer Wilkins
- Roxanne Beckford as Reporter Candice DeSallee
- Nine Onuora as Uniform #1
- Camilla Banus as Girl Swimming
- Wing Armstrong as Medical Examiner Munoz
- Jason Bartley as Crime Scene Officder
- Rob Goodman as Ricky Simmons
- Erik Joseph as Police Officer