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Abigail "Abby" Sciuto is a fictional character from the NCIS television series on CBS Television, and is portrayed by Pauley Perrette. In a season 10 episode entitled "Hit and Run", a young Abby was played by Brighton Sharbino in flashbacks. Like Jethro Gibbs, Anthony DiNozzo, and Dr. Donald Mallard, Abby was introduced in the episodes "Ice Queen" and "Meltdown" of the television show JAG (which together served as the backdoor pilot for NCIS), and, up until May 2018, appeared in every episode of NCIS, in addition to being featured on the show's spin-offs, NCIS: Los Angeles (two episodes) and NCIS: New Orleans (two episodes). The role has made Perrette one of the most popular actresses on U.S. primetime television in 2011, according to Q Score.

Abigail is a forensic scientist at the Naval Criminal Investigative Service headquarters at the Washington Navy Yard, with expertise in ballistics, digital forensics, and DNA analysis. In the first episode of the seventh season, "Truth or Consequences", DiNozzo, while under the influence of a truth serum, describes her as "a paradox wrapped in an oxymoron smothered in contradictions in terms. Sleeps in a coffin. Really, the happiest Goth you'll ever meet." Her gothic style of dress and her interest in death and the supernatural contrast with her generally hyperactive demeanor and enthusiasm about her work.

On October 4, 2017, Perrette announced that she would be departing the show at the conclusion of season 15. CBS aired her final episode on May 8, 2018.

Prior to taking up a career in acting, Pauley Perrette had studied at John Jay School of Criminal Science in New York, having previously aspired "to work with animals, be in a rock 'n' roll band, or be an FBI agent." She eventually began acting, later saying, "There's no drug that I ever did that worked as well as being an actor. What you're looking for with substance abuse is escape. But with acting, you can escape into 1,000 different things without almost killing yourself doing it. Acting is a total drug!"

Abby Sciuto has not been a contender in any CBUB matches.