Double Back is the thirteenth episode of Season Eleven of NCIS and the 247th of the series as a whole.
In an effort to find the terrorist Parsa, Gibbs and the NCIS team track down one of his cohorts using evidence from the drone attack while an emotionally shaken McGee struggles with the ramifications of the incident.
- It's revealed that the final casualty of the black-tie gala bombing is that there are six people dead and twenty-two wounded.
- Delilah Fielding manages to survive the blast but is left permanently paralyzed due to some shrapnel in her spine.
- Abby reveals that Rule 62 is "Always give space to someone when they come out of the elevator".
- Dr. Rachel Cranston mentions Kate and Ziva when talking to Bishop by saying she knew both women who sat at the desk before her.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the Major Case Response Team, NCIS|
|Anthony DiNozzo||Michael Weatherly||Senior Special Agent, MCRT, NCIS|
|Timothy McGee||Sean Murray||Special Agent, MCRT, NCIS|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist,NCIS|
|James Palmer||Brian Dietzen||Assistant Medical Examiner. Credited but did not appear in the episode|
|Donald Mallard||David McCallum||Chief Medical Examiner, NCIS|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Eleanor Bishop||Emily Wickersham||NSA Analyst and NCIS Special Agent.|
|Dr. Rachel Cranston||Wendy Makkena||NCIS Psychologist and the elder sister of the deceased Caitlin Todd.|
|Bashir Malik||Ravi Kapoor|
|Delilah Fielding||Margo Harshman||Special Agent Timothy McGee's Girlfriend.|
|Sofia Martinez||Alanna Ubach||NSA Senior Intelligence Analyst who strongly dislikes DiNozzo.|
|Charles Garrett||Carlton Wilborn||Marine Master Sergeant.|
|Victor Hodge||Jeff Galfer||CIA Case Officer.|
|Nurse 1||Monica Lawson|
|Orderly Miller||Marlon Sanders||The Orderly who briefly appears in the intro scene of the episode.|
|Duke Turner||Kovar McClure||An NIS agent who interrogated Bashir Malik back in 1990.|