Watch Dexter: Original Sin Season HD Full Free on solarmovie.do. Watch Dexter: Original Sin tv series online free. Miami, 1991. When his bloodthirsty urges can't be ignored any longer, young Dexter Morgan must learn...Miami, 1991. When his bloodthirsty urges can't be ignored any longer, young Dexter Morgan must learn to channel his inner darkness as he transitions from student to avenging serial killer with the guidance of his father, Harry.