Nell hugs Hetty when Hetty returns to the OSP office.

Kensi and NCIS investigate the shooting of a militarized dolphin equipped with a Russian microchip.

Fatima and NCIS investigate the shooting of a militarized dolphin equipped with a Russian microchip.

Nell is pleasantly surprised by Hetty's return to the OSP office.

Beale returns to OSP to make Nell an interesting offer.

While Callen suspects Hetty of keeping secrets about his past and Joelle surfaces in her quest to capture Katya, NCIS must track down an informant whose life is in danger. Also, Kensi and Deeks work to expand their family,

Joelle surfaces in her continued quest to capture Katya.

NCIS must track down an informant whose life is in danger.

Admiral Kilbride and NCIS must track down an informant whose life is in danger.

Fatima and NCIS must track down an informant whose life is in danger.

Callen suspects Hetty of keeping secrets about his past.

Callen suspects Hetty of keeping secrets about his past.