Jennifer Carpenter
Jennifer Leann Carpenter (born December 7, 1979) is an American actress. She is known for playing Debra Morgan, the adoptive sister of the title character of the Showtime series "Dexter", for which she earned a Saturn Award in 2009, and also for playing Rebecca Harris in the CBS television series "Limitless".
Christina Robinson (actress)
Christina Robinson (born November 8, 1997) is an American former child actress, best known for playing Astor Bennett on the Showtime TV series "Dexter". She has a twin sister named Courtney Robinson.