In Washington, DC, near the Capitol a van accidentally hits and critically injures a pedestrian, who proves to be The Cooler, a wanted contract assassin, whose next target appears to be a Navy lieutenant commander; Gibbs and company investigate the target, LCdr. Geoffrey Brett, and his circumstances, including the threat. The Cooler briefly regains consciousness in a hospital, then dies before an NCIS agent reaches him. Ziva acts as Brett's protective escort, but he ditches her. Tony and McGee meet a hot chick CPA, then she dies. The three musketeers gather pieces of evidence and, with Gibbs, put them together; Brett says that he needs a lawyer. Meanwhile Abby volunteers to become an organ donor, learns more about herself, visits a pet-rescue center, meets someone whom she admires, examines her own feelings, and has a serious chat with Gibbs. Written by
Did You Know?
In "Enemy on the Hill" Abby is seen holding a locket of her adoptive mother. The photo is Pauley Perrette's real mother Donna Bell. See more
When discussing a mitochondrial DNA match, Abby says that there is a complete match, making the man who shares the match a full sibling.
Not only do they need not be full siblings, they need not even be half siblings.
Mitochondrial DNA is usually passed only from mother to child, with no male contribution; therefore any people with common female to female ancestry can have a complete mitochondrial match.
Abby and the man in question could be third cousins, with mothers who were second cousins, grandmothers who were cousins, great-grandmothers who were sisters, and a great-great-grandmother who is the common mitochondrial ancestor.
They could even technically be further removed than that. See more
Navy Lieutenant Commander Geoffrey Brett
Well, you said the guy's been caught. So there's nothing to worry about.
Special Agent Jethro Gibbs
Whoever hired him to kill you wants you dead. He'll find someone else to do the job.
We would like to put you in protective custody until we know more.
Spoofs Little Orphan Annie