Hawaii Five-0's will wrap up the Wo Fat storyline this fall, and the cast and crew are already preparing to film the informative 100th episode.

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For the last four seasons, Wo Fat has been Steve McGarrett's constant nemesis. Fans will finally get an answer to his long-ranging mystery in the seventh episode of the fifth season.

"I'll tell you this: If there are any lingering questions for people who have been loyally watching the show from the beginning, they're all going to be answered in the 100th episode" said executive producer Peter Lenkov, according to TV Line. "There really will be no more questions, as to, 'Are [Steve and Wo fat] related?' and 'What is Wo Fat's relationship with Steve's mother?' ... That's all going to come to a head and be resolved."

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The episode will film in early September, which means director Larry Teng is already busy scouting locations.

"These waters and clouds and mountains never get old," Teng tweeted on Friday. "Location scouting #H50100 #H50"

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