Fans will see the remaining McGarrett's get together for a monumental family reunion in the upcoming episode of "Hawaii Five-0" season 6.

Aunt Deb (Carol Burnett) has always been the glue that held Steve (Alex O'Loughlin) and Mary Ann (Taryn Manning) McGarrett together. The episodes that featured the McGarrett's feisty aunt have shown what a profound influence she had – and still has - on the siblings, despite their busy lives. Now, Aunt Deb and Mary are set to return in what might be their final episode together.

A synopsis for episode 12 of "Hawaii Five-0" season 6 states that Aunt Deb returns to the island on a very important personal mission. Meanwhile, the "Five-0" team must scramble to discover who took several unstable bombs from WWII bombs that were hidden on the island.

While solving mysteries and stopping big explosions are a forte of the team, Aunt Deb's mission might be more than what Commander McGarrett can handle. According to reports, Aunt Deb's latest arrival in Hawaii might not be all sunshine and roses as she informs Steve and Mary of her cancer returning. She also returned to scatter her husband's ashes in the beautiful island.

A trailer for the upcoming episode, titled "Ua ola loko i ke aloha" or "Love Gives Life Within," starts with Aunt Deb telling Steve and Mary that she and her husband had made a list of things they wanted to do before they pass. Aunt Deb is shown happily trying on a nice dress while a voice over announces that "Carol Burnett returns for one last final farewell." The clip ends with Aunt Deb telling Steve she wants to take his car for a spin. She does and seems to be having a lot of fun driving his truck. Baby Joan is seen in the background while Steve tells his aunt to keep her eyes on the road.

Showrunner Peter Lenkov said in an earlier interview that Burnett's return will serve as "closure for her story." While episode 12 might be the last time "Hawaii Five-0" fans will see Aunt Deb, the heartbreaking episode will undoubtedly have its funny moments too, as there's no one like Burnett when it comes to comedy.

Episode 12 of "Hawaii Five-0" season 6 will air on Jan. 15.