A former NCIS investigative assistant is found stabbed to death, and her murder is linked to a plot to rob a warehouse full of valuable possessions; and a new agent (Sarah Jane Morris) joins the team.
A seaman's murder leads to a serial killer operating in international ports, and Gibbs reluctantly must allow agent E.J. Barrett lead the investigation; and the team finally meets Ziva's boyfriend.
A navy officer is murdered and the team searches for the killer, a petty officer caught in the crime on a Pentagon security camera.
The search for the Port-to-Port killer heats up because his latest victim has ties with NCIS.
In the eighth-season finale, the team members are in grave danger when they finally confront the Port-to-Port killer.
In the ninth-season opener, Tony's secret assignment for the SECNAV leads to an NCIS agent's death and leaves Tony and Gibbs to solve the mystery of how the tragedy occurred.
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