| Episode cast overview, first billed only: | |||
| Michael C. Hall | ... | Dexter Morgan | |
| Julie Benz | ... | Rita Bennett | |
| Jennifer Carpenter | ... | Debra Morgan | |
| C.S. Lee | ... | Vince Masuka | |
| Luna Lauren Velez | ... | Lt. Maria LaGuerta (as Lauren Velez) | |
| David Zayas | ... | Det. Angel Batista | |
| James Remar | ... | Harry Morgan (credit only) | |
| Jimmy Smits | ... | ADA Miguel Prado | |
| Desmond Harrington | ... | Det. Joseph 'Joey' Quinn | |
| David Ramsey | ... | Anton Briggs | |
| Liza Lapira | ... | Det. Yuki Amado | |
| Mike Erwin | ... | Freebo | |
| Christina Robinson | ... | Astor Bennett | |
| Jason Manuel Olazabal | ... | Ramon Prado | |
| Marc John Jefferies | ... | Wendell Owens | |
Several months after the second season finale, Dexter hunts down drug dealer Fred "Freebo" Bowman but mistakenly kills an innocent man who happens to be the younger brother of Assistant District Attorney Miguel Prado. Dexter frames Freebo, but begins to question the necessity of his father's code. Meanwhile, Debra has reformed her life and is determined to become a detective, but refuses an Internal Affairs officer request to co-operate in an investigation of Quinn. Quinn introduces Debra to his informant, Anton Briggs, with hopes of finding clues to Freebo's whereabouts. Also, Rita realizes that she is pregnant.
The First two seasons turned me into a huge fan of this Series. Micheal C Hall essays the title role effortlessly. There is an awesome eerie feeling as the third instalment starts. Julie Benz is hot. Many scenes make you jump to the edge of your seat. The Murders begin and Dexter starts to kill the bad guys.. Brilliant show . I loved Jennifer Carpenter, David Zayas too.