[1][2] Still on enforced leave from NCIS after his heart attack, Ducky decides to re-visit one of his old cold cases, having deceased Navy Commander Bruce Roberts exhumed and re-autopsied in secret.
Gibbs, in keeping with his Rule #38 ("Your case, your lead") puts Ducky in charge of the investigation, since Roberts's murder occurred first.
NASA scientist Dr. Felix Blackwell, when questioned, says ordinary JSC-1 is harmless, but the radioactive material could be used in making a dirty bomb.
The team begins to suspect that Commander Roberts and Sergeant Hill were involved in smuggling materials to make WMDs.
His accomplice was Dr. Blackwell, who falsified the results when Finney and the other buyers sent samples of their "Moon rocks" to NASA to be tested for authenticity.
Blackwell killed Hill when Commander Roberts was exhumed, fearing the earlier murder would be traced back to him.
Blackwell is arrested, and Gibbs informs Ducky that he has finally been cleared to resume his duties as chief medical examiner, much to an overworked Palmer's relief.
[7] Steve Marsi from TV Fanatic gave the episode 4 (out of 5) and stated that "NCIS was a rocking good time tonight, and not just because of an eccentric '80s one-hit wonder or a faux lunar sample.