Toxic is the twenty-first episode in Season Six and also the 134th episode of the entire NCIS series.
Abby joins a top-secret project but soon discovers that nothing is what it seems while the NCIS team investigate the discovery of a Marine's body and soon realize that it might be connected to what Abby's working on and that Abby might be in great danger...
The episode opens with a couple singing to their baby son who's lying in the crib, fast asleep.
The two then leave the bedroom and once the door has closed, Marie asks Drew if he's happy with Drew stating that he asked her to get ice cream.
"Did I tell you to blend it?", Marie hisses.
Drew defends himself, stating that he doesn't remember the blender being that loud.
As they head into the kitchen, Marie rounds on her husband, stating that this morning, Drew didn't remember that the dryer beeps on Wrinkle Guard.
"It was a beep, a single beep", Drew protests before wondering how could something so small with such little ears have bionic hearing?
Suddenly, the sound of their crying son comes over the monitor but then the crying abruptly stops.
The two then breathe a sigh of relief but it's short-lived when a man is heard saying into the monitor, "Help me. Please. Help me".
It cuts to Drew and Marie, both of whom look shocked.
In the bullpen, as the team gather around the monitor, McGee reveals that the victim was Private First Class Marco Riggs. Tony then reveals that Riggs was recently assigned to CLB-3, Combat Logistical Battalion supporting troops.
Ziva then takes over by revealing that was the case until Riggs was accused of stealing equipment and selling it on the black market.
|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/NCIS Liaison Officer and a member of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray (actor)||Junior Special Agent of the NCIS Major Case Response team.|
|Abigail Sciuto||Pauley Perrette||Forensic Specialist associated with the NCIS Major Case Response Team.|
|Leon Vance||Rocky Carroll||Director of NCIS.|
|Donald Mallard||David McCallum||Chief Medical Examiner associated with the NCIS Major Case Response Team.|
|James Palmer||Brian Dietzen||Assistant Medical Examiner, NCIS.|
|Sergeant Major Robert King, USMC||Peter Jason||An old man who is actually the mastermind behind the supposed Tarburst.|
|Jordan Jones||Christopher Cousins||The head of Project Tarburst.|
|Dr. Phillip Heller||Andrew Borba||Scientist and former Project Head who disappeared.|
|Hannah Dunstan, RN||Marianne Muellerleile||Nurse and Ward Matron.|
|Lois Heller||Julie Claire||Wife of Dr. Phillip Heller.|
|Agent Samantha Morris||Felice Heather Monteith||FBI Agent who transports Abby to the research facility and hospital.|
|Unnamed FBI Agent||Keith Burke||FBI Agent and partner of Agent Morris.|
|Orderly||John Brantley Cole||Hospital orderly on the ward overseen by Nurse Dunstan.|
|Private First Class Marco Riggs USMC||Tavis Danz||United States Marine Corps. A patient at the hospital and also the murder victim.|
|Drew (Toxic)||Daniel Travis||Father seen at the beginning of the episode.|
|Marie||Mim Drew||Mother also seen at the beginning of the episode.|