The DrsC just finished watching the season finale for NCIS, numerically it is Season 17, Episode 20. We'd recorded it earlier.
In addition to the usual ensemble, the guest star is Christopher Lloyd, best known for playing Dr. Emmett Brown opposite Michael J. Fox in the Back to the Future series of films. Lloyd plays a quirky old guy better than anybody.
If you haven't seen this NCIS episode already you might check it out. It's a real tear-jerker and quite well done.