‘Hawaii Five-0’ Season 5 Spoilers: McGarrett’s Aunt Deb Brings Romance To The Show; Frankie Valli’s Character Spells Trouble?

"Hawaii Five-0" season 5 spoilers reveal that McGarrett's Aunt Deb will introduce her fiancé, played by Frankie Valli of Four Seasons, to the family. However, her nephew has some reservations about his past.

According to the "Hawaii Five-0" season 5 spoilers, Frankie Valli will play Leonard Campbell, described as a former teacher suffering from stage leukemia.

"They're going to have this whirlwind romance, and they're coming to Hawaii to get married because they realize both of them don't have much time left," executive producer Peter Lenkov revealed to TVGuide in a interview.

Carol Burnett has been tapped to reprise her role as Aunt Deb.

However, Entertainment Weekly dished out more "Hawaii Five-0" season 5 spoilers when it said that Frankie Valli's character may not be upfront with his past, and that sends alarm bells to McGarrett (Alex O'Loughlin).

"The couple met at a cancer support group and (has) now come to Oahu to get married," the website said. "However, McGarrett is suspicious that Leonard is not being completely honest with his aunt about his past."

The episode with Frankie Vallie and Carol Burnett will air on CBS on November 21.

Earlier, Peter Lenkov promised that all the questions about Wo Fat's lineage will be answered by the time the 100th episode rolls along.

The executive producer talked to TVLine where he said that all the questions of fans will be addressed this 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," he said.

"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," Peter Lenkov added.