When a group of young twenty-something neighbors moves in across the hall, Jess and Schmidt are determined to become friends with them. Meanwhile, Nick enacts a series of pranks on Schmidt to make him think he’s getting old.
A murder investigation brings Gibbs and McGee to Afghanistan.
Lois and her competitive sister must reconcile because Susan (Laurie Metcalf) needs a kidney transplant.
The doctors compete for Richard's affections; a surgical patient endangers the lives of those around her; Meredith's mother, who has Alzheimer's disease, experiences a change in her medical condition.
Believing the nuclear material is about to arrive at the Port of LA, Darwyn alerts the FBI to prep for picking up the nuke and taking down the cell.