Hawaii Five-0 will get a visit from AJ Buckley in the second half of season 5.

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The CSI: New York, Supernatural, and Justified alum will drop by to see the Five-0 team in episode 15 (airing order unconfirmed), according to Spoiler TV.

"Packing for Hawaii in the morning," Buckley tweeted on Friday. "Excited to be working on @H50tve #cbs with my buddy @PLenkov #SurfsUp."

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It is currently unknown whether or not the Irish actor will play a hero or a villain.

As viewers await Buckley's episode, McGarrett and his crew will have plenty of other cases to handle. Currently on a three-week hiatus, Hawaii Five-0 will return to CBS on Dec. 12 with a holiday episode.

Titled "Ke Koho Mamao Aku (Longshot)," the ninth installment of the season will see Five-0 travel to the Big Island in order to take on an otherworldly case. When a cowboy is poisoned, McGarrett's team will find themselves on the slopes of Mauna Loa as they investigate a Mars rover testing ground.

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' latest episode.

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Hawaii Five-O, Television, CBS