Di season ini, Anda akan diperkenalkan dengan Dexter Morgan (diperankan secara brilian oleh Michael C. Hall). Dexter adalah pria yang tampak normal di luar—ramah, jenaka, dan ahli dalam pekerjaannya. Namun, di dalam hatinya, ia merasa "kosong" sejak trauma masa kecil menyaksikan ibunya dibunuh. Ayah angkatnya, Harry (James Remar), seorang polisi, mengajarinya "Kode Harry": hanya membunuh penjahat yang lolos dari jerat hukum.
Throughout the season, Dexter's dual life is expertly woven, as he navigates his mundane job and family life while secretly indulging in his dark impulses. His sister, Debra, played by Jennifer Carpenter, is a fellow police officer who becomes increasingly entangled in Dexter's life, both personally and professionally. nonton dexter season 1