Philly is the 5th episode of NCIS Season 14 and the 311th episode of the entire NCIS series.
When a missing MI6 Officer is linked to a murdered Navy Petty Officer, Gibbs sends Quinn and Bishop to Philadelphia to work with MI6 Officer Clayton Reeves with the case prompting Quinn to recall painful memories concerning an NCIS case that made her leave the field and subsequently become an instructor at FLETC.
- Quinn and Torres meet Clayton Reeves for the first time.
|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||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.|
|Alexandra Quinn||Jennifer Esposito||Special Agent for the NCIS Major Case Response Team.|
|Eleanor Bishop||Emily Wickersham||Probationary Agent for the NCIS Major Case Response Team.|
|James Palmer||Brian Dietzen||Assistant Medical Examiner for the NCIS Major Case Response Team. Despite being credited, Dietzen does not appear in this episode.|
|Leon Vance||Rocky Carroll||Director of NCIS. Despite being credited, Carroll does not appear in this episode.|
|Donald Mallard||David McCallum||Chief Medical Examiner for the NCIS Major Case Response Team.|
|Clayton Reeves||Duane Henry||Officer with MI6.|
|Tony Francis||Tony Gonzalez||NCIS Special Agent|
|Mason Finley||Henry Wells Nixon||M16 Intel Officer and mole.|
|Ivan Ahmeti||Dennis Apergis|
|Nestor Carbone||Lou DiMaggio|
|Connie Falco||Dalila Ali Rajah|
|Gary Falco||Michael Felix||Navy Petty Officer Third Class and the main murder victim.|
|Thompson Daly||Glenn Keogh||Masked Man #1.|
|Emily Shaw||Stephanie Y. Wang||Port Authority Lieutenant.|