[5] The series continues to center on the Five-0 Task Force, a specialized state police task force, established by the Hawaiian Governor that investigates major crimes in the state of Hawaii including murder, terrorism, and human trafficking.

In addition, former main cast members, Michelle Borth and Taryn Manning, reprised their roles in a guest starring capacity as their characters Lieutenant Catherine Rollins and Marry Ann McGarrett in the seasons eleventh and twenty-third episodes, respectively.

Former major recurring cast members including Mark Dacascos and Terry O'Quinn also returned as guest stars after long absences in the series.

Also, McGarrett decides to bury the money Kamekona loaned him in a hole he and Junior dig in his backyard.

Lenkov confirmed the announcement and Kimee Balmilero as well as Taylor Wily made guest appearances as their Hawaii Five-0 characters in episodes one and two of Magnum P.I., respectively.

[2] Peter M. Lenkov returned as executive producer and showrunner after signing a new multi-year deal with CBS.

[47][48] In a later interview Lenkov confirmed that CBS ordered additional episodes to the season bringing the count to 25.

[51] Filming for the season officially began on July 10, 2018, with a traditional Hawaiian blessing and concluded on April 19, 2019.

[54] Primary filming for the season takes place in Honolulu, Hawaii, on the island of Oahu.

[56] Exterior shots and outdoor scenes for McGarrett's house are filmed at the Bayer Estate in Aina Haina.

[62] When asked about the mid-season finale, Lenkov stated, "We're bringing back a lot of people that over the years have helped us".

[63][64] On August 22, 2018, it was reported by TVLine that Rochelle Aytes had been cast in a guest role as a character named Greer.

[66] It was later announced that Louis Gossett Jr. and Gladys Knight would guest star in an episode as the father and mother respectively of McBride's character, Lou Grover.

[72][73] On March 6, 2019, it was reported that former main cast member Taryn Manning, who last appeared as a guest star in the sixth season, would be returning as Mary Ann McGarrett.