Angel of Death is the ninety-fourth episode of NCIS and also the Season Four finale episode.
Having returned home, Jenny gets a shock when she realizes that she had a visitor whom she suspects might be her supposedly dead father. In the meantime, all NCIS agents are scheduled for a Homeland Security polygraph test which the CIA has arranged for some reason. Tony and Jeanne later find themselves fighting for their lives when they're taken hostage by a drug dealer, who is desperate to remove his shipment of drugs from the dead body packer.
In the bar, it's relatively empty except for Ziva, Ducky and a few patrons.
At the main area, Ziva remarks that she has a funny feeling.
Ducky tells her that it's the tequila and that she's had three shooters in the time he's been there.
As he says that, Ziva tries calling Tony again with Ziva remarking that it's gone straight to voicemail and that it's just the same when Tony's with her.
- McGee reveals that he has no middle name.
- The team finds out that they're all supposed to take Homeland Security polygraph tests which Gibbs later learns that the CIA were responsible for arranging in the first place.
- Prints that were on the bottle of Scotch Whiskey that Jenny found in her study are soon revealed to match those of Jenny's father, Col. Jasper Shepard who has been dead for twelve years.
- Tony finally meets René Benoit aka "La Grenouille" who is revealed to be the father of Tony's girlfriend, Jeanne.
- The press release issued by CBS Entertainment regarding the episode listed Terrence O'Hara as the director. Conversely, the Internet Movie Database entry lists Dennis Smith as the director.
- This is the third time it has rained or there has been a storm in the NCIS universe, the first two times being Kill Ari Part 1 (episode) and Hiatus Part 1 (episode).
- The song playing in Abby's lab as she gets ready to do some late night work for Jenny is Alien - Alien Sex Fiend.
- This is the last episode of NCIS to be written by creator/director, Donald P. Bellisario as he left the show in May 2007 following reports of a feud between Bellisario and series regular, Mark Harmon.
|Leroy Jethro Gibbs||Mark Harmon||NCIS Special Agent in charge of the NCIS Major Case Response Team.|
|Anthony DiNozzo||Michael Weatherly||Senior Special Agent and second-in-command of the NCIS Major Case Response Team.|
|Ziva David||Cote de Pablo||Mossad Liaison to the NCIS Major Case Response Team.|
|Abigail Sciuto||Pauley Perrette||Chief Forensic Specialist, NCIS.|
|Timothy McGee||Sean Murray||Junior Agent of the NCIS Major Case Response Team.|
|Jennifer Shepard||Lauren Holly||NCIS Director.|
|Donald Mallard||David McCallum||Chief Medical Examiner, NCIS.|
|James Palmer||Brian Dietzen||Ducky's assistant.|
|Jeanne Benoit||Scottie Thompson||Tony's girlfriend.|
|Cynthia Summer||Stephanie Mello||Jenny's secretary.|
|Tobias Fornell||Joe Spano||An agent with the FBI.|
|Michelle Lee||Liza Lapira||An NCIS Special Agent and a member of the legal department.|
|Carly Marcano||Marcy Harriell||A nurse at the hospital. Previously appeared in Trojan Horse (episode).|
|Trent Kort||David Dayan Fisher||An agent with the CIA.|
|René Benoit||Armand Assante||An French arms dealer aka "La Grenouille"/the Frog who is also Dr. Jeanne Benoit's father.|
|Nick Kerry||Alan Smyth||A drug dealer who takes Tony and Jeanne hostage in the hospital morgue.|
|Devon Watson||Mike Erwin||A drug dealer.|
|Bernadette Watson||Shelly Cole||Devon's sister and a drug addict.|
|Annie Hayes||Sandra Thigpen||Another nurse at the hospital.|
|Noemi Cruz||Roxana Brusso||Jenny's maid.|
|ER Orderly||Dayo Ade||A man who works at Monroe University Hospital.|
|Emily Fornell||Payton Spencer||Tobias Fornell's young daughter.|
|Bill (Angel of Death)||Sky Soleil||An orderly at Monroe University Hospital.|
|Little Angel||Samantha Bailey||A young girl who appears in the episode.|
|Melvin||Craig Nigh||An NCIS Special Agent who escorted NCIS Director Jenny Shepard to her home after she returned to America, having spent the last five days attending an anti-terrorist conference in Paris.|
|Jasper Shepard||Webster Williams||Jenny Shepard's deceased father.|
|Gibbs's Ex-Wife||Heather Scobie||Uncredited role.|