Sight Unseen is the 20th episode of NCIS Season 15 and also the 350th episode of the entire NCIS series.
NCIS searches for a Petty Officer suspected of assault who escapes when the sheriff transporting him crashes into a lake while Torres works closely with a key witness who may help the team solve the case.
- This is the milestone 350th episode of the entire NCIS series.
|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.|
|Timothy McGee||Sean Murray (actor)||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. Despite being credited, McCallum does not appear in this episode.|
|Clayton Reeves||Duane Henry||Interagency Liaison between MI6 and NCIS.|
|Annie Barth||Marilee Talkington||Blind witness.|
|Greg Pearson||Robert Mammana||Sheriff.|
|Louise Cabrisio||Sara Fletcher|
|Webber Silk||Greg Cromer||Attorney.|
|Thomas Billings||Delon de Metz||Petty Officer.|
|Rick Odwalla||Matthew Jones||Navy Commander.|
|Mr. Nordstrom||Giovanni Lopes|
|Trevor Barth||Lane Compton||Annie Barth's brother.|