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Obsession is the twenty-first episode in the Season Seven of NCIS and the 159th episode of the entire NCIS series.


A Navy Lieutenant dies but the NCIS team are completely stumped as to what killed him. As they go searching for answers and the killer, Tony becomes fascinated with the dead Lieutenant's sister.


An ambulance arrives outside a hospital, its sirens blaring.

Two medical personnel rush forward and open the back doors as the medic informs them that it's a heart attack, BB 88 over 62, pulse 98.

One medic states "All right. Okay. Steady. Steady. We'll place him down".

As he says, both medics drag the stretcher containing the man onto the ground.

As this happens, the main doctor tells them to be careful before wondering if they've got him.

"Got it", the medic replies.

Meanwhile, a car driving at a dangerous high speed limit races into the car park and it's showing no signs of stopping.

"Look out!", one medic yells.

"Oh my God", a nurse shouts.

"Get him out of the way", the doctor orders. "Go, go, go".

They manage to get the patient and themselves out of the way mere seconds before the car crashes into a parked car.

As the doctor and nurse still tend to the heart attack patient, the medic rushes over.

It then cuts to the medic who's busy examining the driver who's wearing an uniform associated with the United States Navy.

Act One

Act Two

In the bullpen, with a photo of Dana on the monitor, Tony remarks that someone tossed Dana's place pretty good, looking for something.

Ziva remarks that Metro are processing her apartment and that they're going to co-ordinate with NCIS.

Act Three

Act Four

Act Five


Series Regulars

Name Portrayed by Role
Leroy Jethro Gibbs Mark Harmon Special Agent in charge of the NCIS Major Case Response Team.
Anthony DiNozzo Michael Weatherly Senior Agent and second-in-command of the NCIS Major Case Response Team.
Ziva David Cote de Pablo NCIS Probationary Agent and also a member of the NCIS Major Case Response Team.
Timothy McGee Sean Murray (actor) Junior Special Agent of the NCIS Major Case Response Team.
Abigail Sciuto Pauley Perrette Chief Forensic Specialist of the NCIS Major Case Response Team.
Leon Vance Rocky Carroll Director of NCIS.
Donald Mallard David McCallum Chief Medical Examiner of the NCIS Major Case Response Team.

Recurring Cast

Name Portrayed by Role
James Palmer Brian Dietzen Assistant Medical Examiner.
Margaret Allison Hart Rena Sofer Attorney.

Other Cast

Name Portrayed by Role
Dana Hutton Ashley Scott A journalist and the murder victim's brother who later re-emerged, having disappeared after her brother died and helped the team uncover the money hidden in one of the books in the closed bookshop. Unfortunately, it was then discovered that she too had been injected with ricin and would suffer the same fate as her brother. In the basement, Tony informed Gibbs that Dana went peacefully, suggesting that he might have been at her bedside when she died.
Alejandro Rivera Marco Sanchez A member of the Mexican Justice Department who came to NCIS to set up an international task force, he was later revealed to be the younger brother of Paloma Reynosa.
Captain Austin Sears, USN Bobby Hosea Naval Officer.
Maggie Reed Kerrie Keane The owner of the bookshop and the person responsible for killing the Huttons. She is found out and promptly arrested by Gibbs and Ziva.
Rex Carhartt Jonathan Kerrigan A man who appears in the episode.
Joshua Drewe Bob McCracken A man who appears in the episode.
Ambulance Driver Randy Evans A man who appears in the episode.