FLASHBACKS REVEAL THE MURDER CASE THAT FIRST INTRODUCED GIBBS TO NCIS AND HIS INTRODUCTION TO A NEW-TO-THE-U.S. DUCKY, ON THE 400TH EPISODE OF "NCIS," TUESDAY, NOV. 24

Sean Harmon, Mark Harmon's Son, Guest Stars as Young Gibbs; Adam Campbell Guest Stars as Young Ducky

"Everything Starts Somewhere" - Flashbacks reveal the murder case that first introduced young Gibbs (Sean Harmon)
to NCIS and his introduction to young, new-to-America Ducky (Adam Campbell)
, on the 400th episode of NCIS, Tuesday, Nov. 24 (8:00-9:00 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:

Adam Campbell (Young Ducky)
Sean Harmon (Young Gibbs)
Vito D'Ambrosio (Jonny Zucado)
Thomas Crawford (Doctor Walter Magnus)
Dajuan Johnson (NIS Special Agent Edward Scott)
Gabrielle Walsh (NIS Special Agent Michelle Stamos)
Matthew Furfaro (Young Jonny Zucado)
Louis Mustillo (Emilio "Freckles" Zucado)
Jered Solow (Young Freckles)
Franco Fox (Henchman)
Ben Turner Dixon (Young Franks)

WRITTEN BY: Steven D. Binder

DIRECTED BY: Terrence O'Hara