Sister City (Part 1) is the 12th episode of NCIS Season 13 and the 294th episode of the entire NCIS series.
This episode also marks the final appearance of Anton Pavlenko.
When the passengers and fight crew of a private plane belonging to a military tech company including a Navy Commander are discovered to have been fatally poisoned, the NCIS team investigate what happened and during the investigation, they also form a partnership with their New Orleans counterparts as the two teams attempt to find Abby's missing brother and determine a motive for the poisoning.
- Luca Sciuto, Abby's adopted brother is introduced in person for the first time.
- It's revealed that Tony and Zoe have broken up.
- Scott Bakula, Lucas Black, Zoe McLellan and Shalita Grant are all credited as Special Guest Stars.
- Largely because of how it acted as a crossover episode, it does not lead into the credits of NCIS at the end of the episode. Instead, it immediately starts with Sister City: Part 2 upon the end of the episode.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Anthony DiNozzo Junior||Michael Weatherly||Senior Special Agent and second-in-command of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray||Special Agent of the NCIS Major Case Response Team.|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist for the NCIS Major Case Response Team.|
|James Palmer||Brian Dietzen||Assistant Medical Examiner for the NCIS Major Case Response Team.|
|Eleanor Bishop||Emily Wickersham||NCIS Probationary Agent.|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Donald Mallard||David McCallum||Chief Medical Examiner for the NCIS Major Case Response Team.|
|Dwayne Cassius Pride||Scott Bakula||NCIS Special Agent in charge of the NCIS: New Orleans office.|
|Christopher LaSalle||Lucas Black||NCIS Special Agent|
|Meredith Brody||Zoe McLellan||NCIS Special Agent|
|Anton Pavlenko||Lev Gorn||Russian Counselor.|
|Luca Sciuto||Tyler Ritter||Abby's adopted brother.|
|Sonja Percy||Shalita Grant||A former ATF agent who is now an official NCIS Special Agent and who works for the NCIS: New Orleans team.|
|Jenner Blye||Samrat Chakrabarti||A man who appears in the episode.|
|Dalton Greenbrick||Bryan Bat||Blye CFO.|
|Blake Huxley||Alex Quijano||Blye Head of Security.|
|Eva Azarova||Cassidy Freeman||A woman who appears in the episode.|
|Kensington Bloom||Wendy Davis||Navy Captain.|
|Heidi Orr||Jamie Gray Hyder||Navy Petty Officer First Class.|
|Feliz Kane||Abraham Amkpa||Navy Petty Officer First Class.|
|Burly Man||Ilia Volok||A man who appears in the episode.|