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 400^th episode of NCIS, Tuesday, Nov. 24 (8:00-9:00 PM, ET/PT) on the CBS Television Network.