Michael C. Hall Dexter Morgan Actor Julie Benz Rita Bennett Actor Jennifer Carpenter Debra Morgan Actor Erik King Sgt. James Doakes Actor James Remar Harry Morgan Actor Luna Lauren Velez Lt. Maria LaGuerta Actor David Zayas Angel Batista Actor C.S. Lee Vince Masuka Guest Star Geoff Pierson Captain Tom Matthews Guest Star Christina Robinson Astor Bennett Guest Star Daniel Goldman Cody Bennett Guest Star Devon Graye Teenage Dexter Guest Star Dominic Janes Young Dexter Guest Star Rudolf Martin Carlos Guerrero Guest Star Scott William Winters Det. McNamara Guest Star Brad William Henke Tony Tucci Guest Star Mark L. Young Jeremy Downs Guest Star Denise Crosby Nurse Mary Guest Star Lizette Carrion Shanda Guest Star Daniel Cerone Writer Michael Cuesta Director