The team go after a serial killer who keeps the eyes of his victims as souvenirs. The coroner is convinced that the killer has medical training.
Evidence from the murder of a Navy captain leads the NCIS team to Ducky's deceased mother; the team exchange holiday gifts; Gibbs has Christmas dinner with Fornell.
Greg and Katie become ecstatic when they meet a couple without children; Anna-Kat coerces Taylor and Oliver into helping her with a storytelling project.
Sydney and Elijah try two separate cases for ex-college football star Marcus Wright, who is dying; Della is presented with a lifetime achievement award from the LGBTQ community.