Izzie's medical condition requires a difficult surgery; one of Owen's PTSD episodes causes Cristina to be injured.
When a hot shot financial adviser is found shot at a naval station, NCIS investigate the case by interviewing the victim's 3D hologram of herself, which she created before her death.
An FBI agent takes over the case when a two-year-old girl is kidnapped and a hefty ransom demand made. Despite instructions from Beckett to stay away from the investigation, Castle gets involved when he finds out that the FBI agent is her ex-boyfriend.
Leo gives testimony in the congressional investigation into the president's failure to disclose his illness, and President Bartlet threatens to use troops to protect frightened churchgoers on Christmas Eve.
Denny Crane's long-lost son (Freddie Prinze Jr.) resurfaces as the lawyer representing environmental interests against a shopping mall development planned by one of the firm's biggest clients.