"Worst Nightmare" bridges three generations of government workers--the current NCIS team, the retired team of old guys, and the new interns. The two younger groups provide the humor while the old guys, played by William Devane and Sam Anderson, carry the emotional heavy-lifting. For the most part, "Worst Nightmare" is an enjoyable episode, put together well, and has the hallmarks of a decent episode. With NCIS, even when nothing is really happening plot-wise, we can always expect the characters and their quirks to shine through.
Small note, it was implied that Ronald Reagan was responsible for Carmichael killing people. I wonder what Donald Bellisario thought of that.
Score: 8.7/10