Ellie Clayton will return to Hawaii Five-0 in "Wāwahi Moe'uhane (Broken Dreams)."

Danno's Romantic Getaway Turns Dangerous On 'Hawaii Five-0', Will McGarrett Save The Day?

The ADA won't be the only guest star in the midseason premiere. When a young escort is murdered, Steve McGarrett (Alex O'Loughlin) will turn to William Forsythe's Harry Brown. An old-school detective, Brown will help unravel the victim's final moments.

Meanwhile, Clayton will jump in the ring with McGarrett. First seen in season 5's "Ho'oilina" and "Ho'oma'ike," Clayton will drop by once more following the winter hiatus. While it looks like she may have a few choice words with McGarrett in a professional capacity (see photos above), she will also spar with the former Navy Seal during boxing practice.

McGarrett To Meet Wo Fat's Father On 'Hawaii Five-0'? EP Teases Continuation Of Villain's Story

Executive producer Peter Lenkov previously billed Ellie and McGarrett as just friends, but now that Steve and Catherine Rollins' relationship is officially over, the pair may have the chance to take their platonic relationship to the next level.

"Wāwahi Moe'uhane (Broken Dreams)" won't air on Jan. 2, but Hawaii Five-0 fans can get their fix of paradise with this Friday's Christmas episode. Danno and McGarrett will be busy solving the case of a poisoned cowboy, but the duo will also find time to illegally cut their own Christmas tree.

Find out more when Hawaii Five-0 airs Fridays at 9 p.m. ET on CBS. Click the video below to see a preview for the series' next episode.