'NCIS' Finale: Watch Christopher Lloyd Face Off Against Mark Harmon in This Sneak Peek (Exclusive)

The 'Back to the Future' star cameos in the season 17 finale, airing Tuesday, April 14 at 8 p.m. ET/PT on CBS. The team tries to verify the identity of Joe Smith (Christopher Lloyd), who claims he served on the U.S.S. Arizona during the attack on Pearl Harbor, and wants to be buried there upon his death.