That's the basic question at the heart of NCIS
' 200th episode. The landmark hour (airing Tuesday at 8/7c on CBS) takes Leroy Jethro Gibbs (Mark Harmon
) to his favorite diner for his usual morning cup of coffee. But he gets a whole lot more: Out of the blue, a hooded gunman approaches Gibbs, pulls his weapon and fires.Get more scoop on your favorite shows in our Winter TV preview
Cue a string of mind-bending flashbacks that ask ...