Claire flies solo to her college reunion and runs into a professor she once dated, but when Phil shows up things get really awkward.
The NCIS team link the theft of an undersea drone prototype to a video game streamer's elaborate party; Callen and Sam cross paths again with insurance broker Katherine Casillas, who insures the gamer's property.
Jimmy and Jamie defend an elderly man who is accused of killing a mobster; Alan agrees to help a friend with an adulterous spouse.
Martin stumbles upon a homeless man with a familiar knack for numbers; Teller pays Jake a visit.
During their engagement party, Clem and Nick are surprised to discover that the other has been hiding an embarrassing secret about how they met.