Hawaii Five-0 (2010 TV series) season 10

The tenth and final season of the CBS police procedural drama series Hawaii Five-0 premiered on September 27, 2019, for the 2019–20 television season. CBS renewed the series for a tenth season on May 9, 2019. The season contained 22 episodes and concluded on April 3, 2020.

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. All ten main cast members returned from season 9, however Jorge Garcia only appeared in one episode this season. Katrina Law was added to the main cast as Quinn Liu. Former main cast members Masi Oka and Michelle Borth guest-starred as Dr. Max Bergman and Catherine Rollins, respectively.

Four characters from Magnum P.I. guest starred in episode 12, which was a two-part crossover that concluded on Magnum P.I. As with season 9, several characters continued to make guest appearances on Magnum P.I.

The most watched episode of the season was the series finale, "Aloha", with 9.59 million viewers. The second-most-watched was the penultimate episode, "A ʻohe ia e loaʻa aku, he ulua kapapa no ka moana", with 8.44 million viewers.

Main

 * Alex O'Loughlin as Lieutenant Commander Steven "Steve" McGarrett, United States Navy Reserve
 * Scott Caan as Detective Sergeant Daniel "Danny" "Danno" Williams
 * Ian Anthony Dale as Officer Adam Noshimuri
 * Meaghan Rath as Officer Tani Rey
 * Jorge Garcia as Special Consultant Jerry Ortega
 * Beulah Koale as Officer Junior Reigns
 * Katrina Law as Army CID Sergeant Quinn Liu, later Five-0 Task Force
 * Taylor Wily as Kamekona Tupuola
 * Dennis Chun as Sergeant Duke Lukela, Honolulu Police Department
 * Kimee Balmilero as Dr. Noelani Cunha, Medical Examiner
 * Chi McBride as Captain Lou Grover

Recurring

 * Shawn Mokuahi Garnett as Flippa
 * Fernando Chien as Kenji Higashi

Guest stars

 * Gabriel Ellis as Roger Maliah
 * Eugenia Yuan as Daiyu Mei
 * Sonny Saito as Hajime Masuda
 * Rob Morrow as Wes Cullen
 * Joey Lawrence as Aaron Wright
 * Masi Oka as Dr. Max Bergman
 * Christine Lahti as Doris McGarrett
 * Presilah Nunez as Dr. Emma Okino
 * Meta World Peace as himself
 * Cassandra Hepburn as Junior's mother
 * Michelle Hurd as Renee Grover, Lou's wife
 * Alon Aboutboul as Zev Shazam
 * Colby Ryan McLaughlin as Luke
 * Kate Siegel as Joanna Di Pietra
 * Sumalee Montano as Yang
 * Jack Cutmore-Scott as Gabe/Michael Blanton
 * Lance Gross as Lincoln Cole, a decorated former Marine Gunnery Sergeant with the Fleet Anti-terrorism Security Team.
 * Suzanne Cryer as Suzanne Ridge
 * Jean Ota as Iolana Cunha
 * Roy M. Balmilero as Joseph Cunha
 * Enson Inoue as Etsuji
 * Rodney Rowland as Oz
 * Donavon Frankenreiter as himself
 * Zach Sulzbach as Charlie Williams
 * Brittany Ishibashi as Tamiko Masuda
 * Nia Holloway as Bonnie Siobhan; Grover's niece
 * Jimmy Buffett as Frank Bama
 * Willie Garson as Gerard Hirsch
 * Eva De Dominici as Maria
 * James Marsters as Victor Hesse
 * William Sadler as John McGarrett
 * Mark Dacascos as Wo Fat
 * Chuck Norris as Lee Phillips, a retired sergeant major who is helping his mentee; Lincoln Cole
 * Michelle Borth as Catherine Rollins

Crossover characters

 * Jay Hernandez as Thomas Magnum, a former Navy SEAL who is currently a security consultant
 * Perdita Weeks as Juliet Higgins, a former MI6 agent who is currently a majordomo
 * Zachary Knighton as Orville "Rick" Wright, a Marine veteran and former door gunner, who runs his own tiki bar
 * Stephen Hill as Theodore "TC" Calvin, a Marine veteran and helicopter pilot who runs helicopter tours of Hawaii

Episodes
The number in the "No. overall" column refers to the episode's number within the overall series, whereas the number in the "No. in season" column refers to the episode's number within this particular season. The titles of each episode are in the Hawaiian language, though its English translations are directly underneath. "Prod. code" refers to the order in which the episodes were produced. "U.S. viewers (millions)" refers to the number of viewers in the U.S. in millions who watched the episode as it was aired.

Development
On May 9, 2019, CBS renewed the series for a tenth season. CBS announced its fall schedule on May 15, 2019, and it was revealed that the series would undergo a time slot change, with the series being replaced by Magnum P.I. at its previous time slot, and the series now airing an hour earlier, holding the time slot formerly held by MacGyver which moved to mid-season. When interviewed about possible story lines for the tenth season, executive producer Peter M. Lenkov stated, "We're playing it real, with the real things that happen in people's lives as time marches on". CBS revealed its fall premiere dates on June 12, 2019, and announced that the season would premiere on September 27, 2019. Series star Alex O'Loughlin wrote the first filmed episode of the season. On February 14, 2020, it was announced that the season would conclude with a two-part season finale on April 3. It was later revealed this would be the series finale. The decision was based on several factors, most notably O'Loughlin's recovery from on-set injuries and contracts that were set to end this season. CBS had hoped to continue the Danno character in a sequel or continuation, but the producers decided not to go with the idea. As a result of the COVID-19 pandemic the NCAA announced that March Madness 2020 would be cancelled. Following this announcement, on March 13, 2020, CBS announced that with the timeslot being opened up the series finale would be split into two parts, the first part airing on March 27, with the second part airing on April 3, but keeping the series' regular timeslot.

Filming
Early filming for the season began on July 2, 2019, in Los Angeles, California. Filming officially began in Hawaii on July 18 with a traditional Hawaiian blessing. O'Loughlin also directed the first episode filmed. Primary filming for the series continued to take place in Honolulu, Hawaii, on the island of Oahu. The series had a sound stage at Hawaii Film Studio in Diamond Head where it filmed various indoor scenes. Exterior shots and outdoor scenes for McGarrett's house were filmed at the Bayer Estate in ʻĀina Haina.

Casting
On July 20, 2019, Christine Lahti announced that she would be returning as McGarrett's mom Doris McGarrett as a guest star in an episode. On August 14, 2019, it was announced that Katrina Law was joining the main cast as Quinn Liu, a former staff sergeant with Army CID recently demoted for insubordination.

On September 27, 2019, Jorge Garcia, who had played Jerry Ortega since the fourth season, left the series following the season premiere to focus on other projects; in the show, after recovering from being shot in the ninth season finale, Jerry leaves the task force to focus on writing a book. Garcia and producer Peter Lenkov both confirmed the former's exit, but assured that the door would be open for Jerry to later return as a guest star. Garcia is set to cross-over onto one of Lenkov's other series MacGyver during its fifth season portraying Jerry Ortega as a guest star. MacGyver previously crossed-over with Hawaii Five-0 in their first and seventh seasons, respectively.

On February 14, 2020, it was revealed that Lance Gross would have a major guest role for the two-part season finale with the possibility for Gross to become a series regular pending renewal of an eleventh season. However, on February 28, 2020, it was announced that the series would end after the tenth season. Chuck Norris made a cameo appearance in the season's penultimate episode as Lee Phillips, a retired sergeant major who is helping his mentee; Lincoln Cole. Former main cast member Michelle Borth returned in the final moments of the series finale as Catherine Rollins; however, her appearance was not mentioned in any press releases put out prior to the episodes airing. To avoid any spoiler she was also not included in the opening guest star credits. Instead, she appeared in the closing credits within her own caption.