NCIS Database

Sound Off is the 13th episode of NCIS Season 17 and also the 391st episode of the entire NCIS series.


After a body is found at an unmanned aerial vehicle testing site, the NCIS team must determine if the death was murder or an accident while Palmer carefully interviews medical assistant candidates.


Act One

Act Two

Act Three

Act Four

Torres and Bishop in Interrogation.

Act Five

Major Events

  • Jimmy begins looking for an assistant.


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.
Jacqueline Sloane Maria Bello NCIS Forensic Psychologist
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.

Other Cast

Name Portrayed by Role
Diana Murphy Katie Leclerc Marine Staff Sergeant who is also deaf and the ex-girlfriend of murdered retired Marine Gunnery Sergeant Danny Backer.
Edison Geary William R. Moses
George Ingram David Burke The killer.
Christopher Crane Peter Graham
Zahir Najjar Amir Korangy Professor at MIT.
Ronald Kepczak Adam William Zastrow Marine Gunnery Sergeant Danny Backer's step-brother.
  v - e - dNCIS Season 17
Out of the Darkness (episode)Into the Light (episode)Going Mobile (episode)Someone Else's Shoes (episode)Wide Awake (episode)Institutionalized (episode)No Vacancy (episode)Musical Chairs (episode)IRL (episode)The North Pole (episode)In The Wind (episode)Flight Plan (episode)Sound Off (episode)On Fire (episode)Lonely Hearts (episode)Ephemera (episode)In a Nutshell (episode)Schooled (episode)Blarney (episode)The Arizona (episode)