The Penelope Papers

NCIS is assigned the case of Paul Booth, a Navy lieutenant who is shot dead in a park after talking to his pregnant wife. During the process, McGee's business card from his days in Norfolk is found in the victim's pocket, leaving McGee confused as he has no knowledge of ever meeting the victim. Booth was a friend of McGee's maternal grandmother, Penelope Langston, who developed a research project for the military known as the ANAX Principle before the outbreak of the Vietnam War. The ANAX Principle was then shut down for four decades before being restarted. It uses specially bred caterpillars as the basis of a genetically engineered/Biomechanical plague. Booth's killer is revealed as Max Ellswood, one of the original researchers of the ANAX Principle, who killed the lieutenant when Booth planned to reveal the program to the press. At the end of the episode, McGee and his grandmother speak of how Gibbs reminds them of McGee's father. McGee ultimately decides to call his dad whom he hasn't spoken to in seven years. Meanwhile, Jimmy Palmer struggles with plans for his upcoming wedding.