Fallout is the 23rd episode of NCIS Season 15 and also the 353rd episode of the entire NCIS series.
While Gibbs attends the memorial service for a friend who was lost at sea, he discovers that the deceased man, Navy Captain Phillip Brooks, has been hiding in a fallout shelter after his boat was attacked and he swam to shore.
- It is revealed that a few days have passed since Clayton Reeves's death.
- This is the first ever episode where Pauley Perrette (Abby Scuito) doesn't appear.
- Despite being credited, Pauley Perrette and Duane Henry don't appear in this episode.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist for the NCIS Major Case Response Team. Credited only.|
|Timothy McGee||Sean Murray||Senior Special Agent and second-in command of the NCIS Major Case Response Team.|
|Nicholas Torres||Wilmer Valderrama||Special Agent for the NCIS Major Case Response Team.|
|Eleanor Bishop||Emily Wickersham||Special Agent for the NCIS Major Case Response Team.|
|James Palmer||Brian Dietzen||Assistant Medical Examiner for the NCIS Major Case Response Team.|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Jacqueline Sloane||Maria Bello||NCIS Special Agent.|
|Donald Mallard||David McCallum||Chief Medical Examiner for the NCIS Major Case Response Team.|
|Clayton Reeves||Duane Henry||Interagency Liaison between MI6 and NCIS. Credited only.|
|Kasie Hines||Diona Reasonover||Forensic Scientist.|
|Phillip Brooks||Don Lake||Navy Captain.|
|Marcy Brooks||Susan Walters|
|Antonia Morello||Ali Hillis|
|Sean Parks||Rick Cosnett|
|Amanda Graham||Nicola Lambo||CGIS Special Agent.|
|David (Fallout)||Stephen Jared|
|Steve (Fallout)||John Eddins|
|Vendrell Brown||Japheth Gordon|
|Glen Collins||Landon Ashworth|
|ND Caddy||Bobby Ray Cauley Jr.|
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