Dr Donald 'Ducky' Mallard is NCIS's resident M.E. His first assistant Gerald Jackson was shot in the arm by Ari Haswari and retired; he was joined by Jimmy Palmer. He has a habit of going into long and rambling stories about his past. He also talks to the corpses as though they were alive and listening
|Full name||Donald Mallard|
|First Appearance||Yankee White|
He lived with his mother (deceased 2010 before it was stated in Double Identity) in a large mansion, but he is in the process of buying a historic Georgetown house.
Went to Eton College and graduated from University of Edinburgh Medical School.
 Leroy Jethro Gibbs
Ducky and Special Agent Leroy Jethro Gibbs have a long relationship which began when Gibbs an Jenny Shepard were undercover in France when they escaped on a boat with the help of Ducky. Their relationship changed after Gibb's memory lost in the episode Hiatus as Ducky felt hurt that Gibb's did not tell him about his daughter and first wife. This changed when Gibb's apologised (breaking one of Gibb's rules) about not telling him. Ducky is one of the only people who call him 'Jethro'
 Caitlyn Todd
Special Agent Caitlyn Todd and him have a father/daughter relationship. He would refuse to call her Kate and always called her Caitlyn. He comforted her over the condition of Special Agent Anthony DiNozzo in the episode SWAK. In the aftermath of Bete Noire he said he wanted Ari Haswari on one of these slabs. When looking at her corpse in the body bag in Kill Ari: Part 1 he said 'I am so sorry Caitlyn'
 Ziva David
Ducky and Ziva David had a good relationship, the fact she saved his life helped their relationship. He calls her his friend in Good Cop, Bad Cop and is concerned for her mental health in episodes 2, 3, and 4 of Season 7.
 Abigail Sciuto
Him and Abigail Sciuto have a good relationship; this is shown in many episodes by them comforting each other, such as when Abby goes to Ducky’s mother’s grave at the end of Double Identity to comfort him. He is the one and only person to call her her full name 'Abigail'
 Jimmy Palmer
Him and Jimmy Palmer have a father/son sort of relationship. Much like Anthony DiNozzo and Leroy Jethro Gibb's. Jimmy is one of the few people close to him that do not call him Ducky, instead calling him Doctor Mallard, Ducky then calls him Mr Palmer.
There is a joke between the two about whenever they are late it is Jimmy’s bad driving to which he will reply 'You're the one with the map'