Martin William Harris

It's up to Mac and the team to find a kidnapped mobster-turned-informant when a worried crime boss whisks him off to Chernobyl.

The NCIS team links the theft of an undersea drone prototype to a video game streamer's elaborate party. Also, Callen and Sam cross paths again with insurance broker Katherine Casillas (Moon Bloodgood), who insures the gamer's property and processions.

Team Scorpion's job to find sunken treasure goes awry when Walter and Paige's boat explodes, leaving them lost in the middle of the Pacific Ocean surrounded by sharks.