Catherine Rollins has one more episode with the Hawaii Five-0 team, and the series will be using it to shed a little light on the former Lieutenant.

The newest full time member of the Five-0 task force, Rollins (Michelle Borth) left her Navy career behind her at the start of season 4 but the past will come back to haunt her in "Makani ʻOlu a Holo Mālie (Fair Winds and Following Seas)."

Still indebted to an Afghan family that risked it all to save her when she was wounded in the line of duty, Rollins won't even hesitate when it comes time to return the favor. The Taliban has taken her saviors' young son and Rollins will enlist McGarrett's (Alex O'Loughlin) Navy SEAL expertise to get him back.

Although the plan will go slightly sidewise - i.e. McG will nearly be executed - viewers will get a look at quick look at a pre-Five-0 Rollins before she makes her series exit.

McGarrett Makes 'Heartbreaking Decision' In Afghanistan, Will It Deal With Catherine Rollins?

"[The episode will feature] some flashbacks to her stint in the military," explained executive producer Peter Lenkov, according to TV Line. "You'll get to know her as a soldier, when she was actually in the Navy."

You will also get to find out just how important (or unimportant) the McRollins relationship really is. As the intense episode unfolds, someone will say "I love you too."

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Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS. Click the video below to see a preview for "Makani ʻOlu a Holo Mālie."

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Hawaii Five-O, CBS, Television