Can the 'NCIS: LA' Team Stop a Potential Outbreak? (PHOTOS)

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Yellow Jack
Bill Inoshita/CBS
Yellow Jack
Monty Brinton/CBS

Callen (Chris O’Donnell)

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Wesam Keesh returns as Ehsan Navid.

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Monty Brinton/CBS

Who’s in the photos?

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Monty Brinton/CBS

Sam (LL Cool J), Navid, and Callen

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Monty Brinton/CBS

Uh oh, this doesn’t look good.

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Deeks (Eric Christian Olsen) and Kensi (Daniela Ruah), with United States Army Medical Research Institute of Infectious Diseases’ Colonel Sandra Kaufman (Lesley Fera)

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Bill Inoshita/CBS

Kensi and Kaufman

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Bill Inoshita/CBS

What have they found?

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Bill Inoshita/CBS

Will they need their guns?

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Bill Inoshita/CBS

Time to get those suits off?

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Bill Inoshita/CBS

Kensi and Deeks

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Bill Inoshita/CBS

The calm before the storm

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Who killed the petty officer?

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Deeks

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NCIS: Los Angeles is traveling back to the USS Allegiance this season, but don't expect to see JAG's Harm (David James Elliott) again.

Sam (LL Cool J) and Callen (Chris O'Donnell) will be joined by a familiar face while they're on board: Ehsan Navid (Wesam Keesh), whom the team first met on a case in Season 5's "Allegiance." And he's since joined NCIS!

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These actors left quite the impression on the show and fans.

But it's not an entirely happy reunion in "Yellow Jack," given that while the agents are aboard the ship, it's placed under quarantine for a possible Ebola exposure. Back on dry land, Kensi (Daniela Ruah) and Deeks (Eric Christian Olsen) investigate the murder of a petty offer who recently left the USS Allegiance and is linked to the Ebola exposure.

Click through the gallery above to see who wears the Hazmat suit the best and a look at the team's investigation.

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