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".
Dexter's Laboratory
Dexter manages to keep his lab a secret from his clueless Mom (voiced by Kath Soucie) and Dad (voiced by Jeff Bennett), who never take notice of it. However, he is frequently in conflict with his hyperactive older sister, Dee Dee (voiced by Kat Cressida in seasons 1–10). In spite of Dexter's advanced technology, Dee Dee eludes security, and once inside her brother's laboratory, she delights in playing haphazardly, wreaking havoc with his inventions. Though seemingly dim-witted, Dee Dee outsmarts her brother and even gives him helpful advice. For his part, Dexter, though annoyed by his intrusive sibling, feels a reluctant affection for her and will come to her defense if she is imperiled.