GIBBS AND FORNELL'S CRUSADE TO FIND THE HEAD OF THE DRUG RING RESPONSIBLE FOR EMILY'S OVERDOSE COMES TO A CLIMAX AND GIBBS AND VANCE LET THE TEAM IN ON A CASE THAT HAS DANGEROUS IMPLICATIONS, ON "NCIS," AT A SPECIAL TIME, TUESDAY, JAN. 19

"Head of the Snake" - Gibbs and Fornell's crusade to find the head of the drug ring responsible for Fornell's daughter Emily's overdose comes to a climax. Also, Gibbs and Vance finally let the team in on a case that has dangerous implications, on NCIS, at a special time, Tuesday, Jan. 19 (9:00-10:00 PM, ET/PT) on the CBS Television Network.

REGULAR CAST:

Mark Harmon (NCIS Special Agent Leroy Jethro Gibbs)
Sean Murray (NCIS Special Agent Timothy McGee)
Emily Wickersham (NCIS Special Agent Eleanor "Ellie" Bishop)
Wilmer Valderrama (NCIS Special Agent Nicholas "Nick" Torres)
Maria Bello (NCIS Special Agent Jaqueline "Jack" Sloane)
Brian Dietzen (Medical Examiner Jimmy Palmer)
Diona Reasonover (Forensic Scientist Kasie Hines)
Rocky Carroll (NCIS Director Leon Vance)
David McCallum (Dr. Donald "Ducky" Mallard)

GUEST CAST:

Joe Spano (Tobias "T.C." Fornell)
Margo Harshman (Delilah Fielding)
Juliette Angelo (Emily Fornell)
Nick Boraine (Merriweather a.k.a. Alexi Myshkin)
Anna Grace Barlow (Karen a.k.a. Sasha Myshkin)
Tajh Bellow (Navy Petty Officer Second Class Samuel Miles)
Isiah Adams (Chad Hamilton a.k.a. Vladmir Ivinov)
Neal Kodinsky (Viktor)
Tudor Munteanu (Ivan)
Geri-Nicole Love (Paramedic)

WRITTEN BY: Brendan Fehily and David J. North

DIRECTED BY: Tawnia McKiernan