Hawai Five-0 will answer some major Wo Fat questions in season 5, but viewers will have to wait until the 100th episode to find out more.

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Wo Fat (Mark Dacascos) made a dramatic reappearance during the season 4 finale, surprisingly swooping in to off Ian Wright (Nick Jonas) and save Grover's (Chi McBride) daughter. His seeming act of kindness, however, doesn't mean Wo Fat has turned over a new leaf. It's very unlikely that the master criminal became McGarrett's (Alex O'Loughlin) best friend while in prison.

Luckily, the series' 100th episode will take a major step towards wrapping up the Wo Fat mystery and the numerous other questions that have spiraled off his story, according to TV Guide.

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"There it is #H50 fans... Episode 100," tweeted director Larry Tang alongside a photo of the title page on Friday. "Y'all gonna lose yer sh-t. #Epic."

Executive producer Peter Lenkov ("O ka Pili'Ohana ka 'Oi," "Makani 'Olu a Holo Malie") penned the episode, which will air as the seventh of the season.

Find out more when Hawaii Five-0 returns to CBS on Sept. 26 at 9 p.m. Click the video below to see a preview for the series' latest episode.

Tags: Hawaii Five-O television CBS