'NCIS: LA' Searches for Anna After She Escapes From Prison (PHOTOS)

Meredith Jacobs

Early in Season 10, Deputy Director Louis Ochoa (Esai Morales) advised Callen (Chris O'Donnell) to consider celibacy, and one of the reasons for that — Anna Kolcheck (Bar Paly) — returns in Sunday's NCIS: Los Angeles.

Anna is serving time for killing Sokolov (Costas Mandylor) when he was unarmed. However, in "The One That Got Away," she escapes from prison with her cellmate. Callen and the rest of the team help with the investigation and search for her whereabouts.

10 'JAG' Stars Who Appeared on 'NCIS,' 'NCIS: LA' & 'NCIS: New Orleans' (PHOTOS)

10 'JAG' Stars Who Appeared on 'NCIS,' 'NCIS: LA' & 'NCIS: New Orleans' (PHOTOS)

David James Elliott and Catherine Bell aren't the first alums to reprise their roles.

Click through the gallery above to see where their search takes them.

CBS also released sneak peeks from the episode.

In the first (below), Callen teases Sam (LL Cool J) about how he brushed off a woman he knew while undercover. "I was only cruel to be kind," Sam says.

Hetty Returns to the 'NCIS: LA' Office and Sets Up 2 Potential Exits

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Is a permanent change coming to OSP's Ops Center?

U.S. Marshal Will Reyes (Matty Castano) interrupts their banter to inform them of Anna's escape. Watch his response when Callen wonders how he found him.

Then, in the second clip, it's up to Kensi (Daniela Ruah) and Deeks (Eric Christian Olsen) to deal with Anna's father, Arkady (Vyto Ruginis), who refuses to be a "good boy" and wait at home.

"I cannot sit idly by while my Anna is being hunted like bear," he tells them.

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The cast and crew take us behind the scenes of the very special return that had everyone in tears.

Before they can push him out of the boathouse, he insists he knows the man sitting in one of their interrogation rooms. But does he?

NCIS: Los Angeles, Sundays, 9/8c, CBS