Meredith and Lexie's father returns to Seattle Grace with stomach pains and a new girlfriend; Alex butts heads with the new OB; Mark bribes Jackson for information on Lexie.
Rookie cop Ben Sherman wonders if he is cut out for the job; a girl is kidnapped.
Callen, Sam, Kensi, and Deeks cancel their Christmas plans, climbing onboard an aircraft carrier to investigate the murder of a fellow NCIS Special Agent.
An unidentified woman is found dead in an alley; Nate's little sister goes missing and secrets from his past unfurl.
The team heads outside the hospital to help provide medical attention at the scene of an emergency.