Watchdog is the 10th episode of NCIS Season 18 and the 408th episode of the entire NCIS series.
Synopsis
NCIS uncovers a secret dogfighting ring which leads to an unexpected move by one of the team members.
Prologue
Act One

Torres in the waiting room of the veterinary clinic.
Act Two
Act Three
Act Four
Act Five
Major Events
- Gibbs is suspended for assaulting an animal abuser.
- McGee is becoming temporary team leader of the NCIS Major Case Response Team.
Trivia
Cast
Series Regulars
Name | Portrayed by | Role |
---|---|---|
Leroy Jethro Gibbs | Mark Harmon | Special Agent in charge of the NCIS Major Case Response Team. |
Timothy McGee | Sean Murray | Senior Special Agent and second-in-command of the NCIS Major Case Response Team. |
Eleanor Bishop | Emily Wickersham | Special Agent for the NCIS Major Case Response Team. |
Nicholas Torres | Wilmer Valderrama | Special Agent for the NCIS Major Case Response Team. |
James Palmer | Brian Dietzen | Chief Medical Examiner for the Major Case Response Team. |
Kasie Hines | Diona Reasonover | NCIS Forensic Specialist. |
Leon Vance | Rocky Carroll | Director of NCIS. |
Donald Mallard | David McCallum | NCIS Historian. Despite being credited, McCallum doesn't appear in this episode. |
Recurring Cast
Name | Portrayed by | Role |
Grace Confalone | Laura San Giacomo | Doctor. |
Eugene Coyle | Hugo Armstrong | NCIS Inspector General. |
Guest Cast
Name | Portrayed by | Role |
Luke Stana | Max Adler | |
Ed Thomas | Rickey Eugene Brown | Navy Petty Officer Third Class. |
Carlos Garcia | Marcos Favela | Navy Petty Officer Third Class. |
Ruthann Harrison | Nancy Linehan Charles | |
July Wunderman | Amrapali Ambegaokar | Lawyer. |
Shawna Street | Nikki Crawford | Doctor. |
Ben Randall | Jordan Murphy | Navy Commander. |