Magnum P.I. (2018 TV series)

• Jay Hernandez as Thomas Magnum, an ex-US Navy SEAL who is a security consultant and private investigator
• Perdita Weeks as Juliet Higgins, an ex-MI6 agent who is majordomo of Robin Masters' estate and Magnum's investigative partner
• Zachary Knighton as Orville "Rick" Wright, a retired Marine Sergeant who runs his own tiki bar
• Stephen Hill as Theodore "T.C." Calvin, a retired Marine Major and pilot who runs helicopter tours of Hawaii
• Amy Hill as Teuila "Kumu" Tuileta, the curator for the cultural center on Masters' estate
• Tim Kang as Gordon Katsumoto, a Honolulu Police Department detective

• James Remar as Captain Buck Greene (seasons 2 and 5; guest season 1)
• Domenick Lombardozzi as Sebastian Nuzo (season 1; guest seasons 2 and 4)
• Corbin Bernsen as Francis "Icepick" Hofstetler (seasons 1–3)
• Christopher Thornton as Kenny "Shammy" Shamberg
• Bobby Lee as Jin Jeong (seasons 2–5)
• Betsy Phillips as Suzy Madison (season 3; guest seasons 2, 4 and 5)
• Jay Ali as Dr. Ethan Shah (season 3; guest season 4)
• Lance Lim as Dennis Katsumoto (season 3; guest seasons 4–5)
• Chantal Thuy as HPD Detective Lia Kaleo (season 4)
• Martin Martinez as Cade Jensen (season 4)
• Michael Delara as Gabriel Santos/M.E. Tech (season 4)
• Michael Rady as HPD Detective Chris Childs (season 5)

• Kimee Balmilero as medical examiner Noelani Cunha (seasons 1–3)
• Taylor Wily as entrepreneur Kamekona Tupuola (seasons 1–2)
• Dennis Chun as HPD Sergeant Duke Lukela
• Shawn Mokuahi Garnett as Flippa (seasons 2–3)
• Kala Alexander as Kawika (season 1)
• Larry Manetti as Nicky "The Kid" DeMarco (season 2 and 5)
• William Forsythe as Private Investigator Harry Brown (season 2)
• Willie Garson as Gerard Hirsch (season 2)
• Beulah Koale as Officer Junior Reigns (season 2)
• Meaghan Rath as Officer Tani Rey (season 2)
• Katrina Law as Sergeant Quinn Liu (season 2)
• Ian Anthony Dale as Officer Adam Noshimuri (season 2)

In October 2017, CBS announced development of a reboot of Magnum, P.I. from Peter M. Lenkov, who also developed the 2010 reboot of Hawaii Five-O and the 2016 reboot of MacGyver. The network ordered a pilot production commitment for the series with Lenkov and Eric Guggenheim, a Hawaii Five-0 writer and co-showrunner, as developers.[10] John Davis and John Fox of Davis Entertainment were reported as additional executive producers.[11] CBS Television Studios and Universal Television co-produced the series.[10] Danielle Woodrow was also later announced to be serving as an executive producer.[12] The series was initially picked up by CBS for thirteen episodes,[13] and an additional seven episodes were later ordered.[14][15] On January 25, 2019, Magnum P.I. was renewed for a second season along with two other CBS freshman series.[16] Lenkov returned for the second season as an executive producer and co-showrunner after signing a three-year deal with CBS Television Studios in 2018.[17][18] Guggenheim also returned as executive producer and co-showrunner.[19] It was later revealed that the second season would consist of twenty-episodes.[20]

On May 6, 2020, CBS renewed the series for a third season, along with eighteen other television shows.[21] In July 2020, it was revealed that Lenkov would not have any involvement in the third season after being fired from CBS over toxic work environment allegations.[22] He was originally expected to continue work on the series throughout the season as part of the previously signed deal.[23][24] Lucas Till who portrays the title character of Angus MacGyver on MacGyver stated that Lenkov made him suicidal and constantly body shamed him.[25] Lenkov's lawyers initially denied all allegations.[26] Lenkov later responded to the situation by stating "It's difficult to hear that the working environment I ran was not the working environment my colleagues deserved, and for that, I am deeply sorry. I accept responsibility for what I am hearing and am committed to doing the work that is required to do better and be better."[27] Lenkov still received writing credits for various episodes throughout the season written prior to his termination.[28] Gene Hong replaced Lenkov as co-showrunner joining Guggenheim who continued working on the series.[29] In October 2020 it was reported that the third season would have a reduced episode order of sixteen episodes as a result of the COVID-19 pandemic.[30] On April 15, 2021, CBS renewed the series for a fourth season,[2] which premiered on October 1, 2021.[3]

On February 20, 2018, it was announced that Jay Hernandez had been cast as Thomas Magnum, who was portrayed by Tom Selleck in the original series.[31] Perdita Weeks was cast as Juliet Higgins on March 2, 2018.[32] The character of Higgins was genderswapped, from their 1980 counterpart Jonathan Higgins.[33] Lenkov sand Guggenheim stated that while they wanted to honour the original show it was important for the reboot to "stand on its own" and genderswapping allowed for differentiation.[34] Zachary Knighton and Stephen Hill were later cast as Orville "Rick" Wright and Theodore "T.C." Calvin, respectively.[35][36] Tim Kang and Amy Hill were the last two to be cast in the series, as Detective Gordon Katsumoto and Kumu, respectively.[37][38]

Kimee Balmilero, Taylor Wily, and Dennis Chun all appeared as their Hawaii Five-0 characters throughout the first season.[39] Chun guest starred on the original Magnum, P.I. as various minor characters throughout its run.[40] Domenick Lombardozzi, Ken Jeong, and Christopher Thornton were cast in recurring roles.[41][42][43] Former NFL and CFL football player Carl Weathers, MLB baseball player Christian Yelich, and NASCAR driver Ryan Blaney all appeared as guest stars.[42][44][45] Roger E. Mosley, who starred as Theodore Calvin in the original Magnum, P.I., guest starred in one episode.[46] Betsy Phillips, series star Zachary Knighton's wife, appeared in the first season's final episode.[47] Selleck stated in an interview that he would never appear in the series, even though he was asked, so as not to take away from the original Magnum, P.I. and due to conflicting filming of Blue Bloods, which also airs on CBS.[48]

Thornton continued to recur throughout the second, third, and fourth seasons.[49][50] Bobby Lee was introduced as a new recurring character in the second season and also returned for guest appearances in the third and fourth.[51][52] Numerous professional athletes appeared in guest roles throughout the second season, including Deontay Wilder, a World Boxing Council heavyweight champion; Aaron Donald and Andre Reed, National Football League players; Hans Hedemann, a competitive surfer; and Cowboy Cerrone, an Ultimate Fighting Championship mixed martial artist.[53][54][55][56] Patrick Monahan, Skyler Grey, Jerry Becker, and Luis Carlos Maldonado appeared as themselves in season two and performed as their real world band Train.[57]

Balmilero, Wily, and Chun also made appearances throughout the second season as their Hawaii Five-0 characters.[58] Other Hawaii Five-0 actors new to the second season include series regulars Meaghan Rath, Katrina Law, Beulah Koale, and Ian Anthony Dale, all of whom appeared as their Hawaii Five-0 characters.[58][59][60] In addition, guest stars from Hawaii Five-0 including Larry Manetti, William Forsythe, Shawn Mokuahi Garnett, and Willie Garson all appeared as the same characters from Hawaii Five-0 as well.[40][61][62] Manetti previously starred on the original Magnum, P.I. as Rick Wright.[40]

On October 16, 2020, it was announced that Jay Ali had been cast in a recurring role for the third season as Dr. Ethan Shah.[63][64] It was later revealed that Lance Lim would also recur in the third season.[65] Mosley again returned as a guest star in the third season.[66] Balmilero, Chun, and Garnett from Hawaii Five-0 continued appearances in the third season despite Hawaii Five-0's cancellation.[67][68]

Chantal Thuy joined the cast in a recurring capacity for the fourth season.[69] Thuy portrayed Lia Kaleo, an HPD detective and partner to Katsumoto, as well as a love interest to Magnum.[70] Martin Martinez also joined the recurring cast for the fourth season portraying Cade Jensen, a trouble teenager searching for a job.[71][72] Chun appeared once more in the fourth season.[73] Ahead of the fifth season Michael Rady was cast in a recurring role to portray Detective Chris Childs.[74]

The pilot episode filmed in March and April 2018 at Hawaii Film Studio.[75][76] It was directed by Justin Lin, who also directed other CBS pilots.[12] The rest of the first season began filming on July 23, 2018, with a traditional Hawaiian blessing.[12][77] Filming for the series takes place in the state of Hawaii on the island of O'ahu at Kalaeloa Studio.[78] The fictional Robin's Nest Estate where Magnum and Higgins lives is located at Kualoa Ranch, a location which Jurassic World also used as a filming location.[78] Other filming locations include numerous beaches, such as Maili, Waikiki, and Kapolei.[79] A central theme of the original series was Magnum's constant use of a Ferrari, which has become a cultural icon inextricably linked to the series.[80] Then Magnum almost exclusively favored the Ferrari 308 GTS, such that it was briefly shown in the pilot episode.[81] The production team, however, updated his favored vehicle to a Ferrari 488 Spider.[82] Both cars are a mid-engine, rear-wheel-drive, 2-seat, roadster variant of the current V8 Ferrari.

Filming for the second season also began with a traditional Hawaiian blessing on July 8, 2019.[83] A new filming location in the second season is the La Mariana Restaurant, an operating Tiki Bar in Hawaii.[79] Delayed by the COVID-19 pandemic, filming for the third season began on September 16, 2020.[84] COVID-19 protocols were required on set including masks, social distancing, COVID testing, and reduced cast and crew on set.[85] Fourth season filming commenced on July 20, 2021, with many COVID-19 precautions still in place.[86] The fourth season also introduced new crew members to production after a number of those who worked on previous seasons transferred to work on NCIS: Hawaiʻi.[86]

On May 12, 2022, CBS canceled the series after four seasons.[4] Cancellation of the series had negative effects on Hawaii's film industry, leaving 350–400 people without employment.[87] However, on May 23, 2022, it was reported by TVLine that Universal Television was trying to shop the series around.[88] Ten days later, Deadline Hollywood reported that talks were underway for Universal to carry the series in-house via NBC and/or USA. Such a move would have required a deal with CBS Studios by June 30, 2022, when the cast members' options on their contracts ended.[89] Although not officially renewed, Production Weekly reported a fifth season to be in "active development", though with no network attached to the listing.[90] On June 30, 2022, NBC officially picked up the series for 20 episodes, initially to be split over two 10-episode seasons, with the option for more episodes. At the time, it was reported that all six cast members were expected to return, along with the executive producers, and CBS Studios and Universal TV would continue to co-produce the series.[5] On July 4, 2022, it was reported by TVLine that production on the fifth season would begin in late 2022, with the season not likely to premiere until January 2023 at the earliest.[91] Filming for the fifth season began on September 19, 2022.[92] The fifth season premiered on February 19, 2023.[6] It was later clarified that the twenty episodes would be split as a two-part fifth season rather than into two separate seasons.[9] On June 23, 2023, it was announced that the fifth season is going to be the final season.[7]

Magnum P.I. has been met with mixed reviews. On review aggregation website Rotten Tomatoes, the first season holds an approval rating of 57% with an average rating of 6.35/10, based on 21 reviews. The website's critical consensus reads, "The rebooted Magnum P.I. may not be quite distinctive enough to hold up to comparisons with its source material, but a charismatic star, slickly staged action, and a handful of modern twists hint at greater potential."[94] Metacritic, which uses a weighted average, assigned the first season a score of 48 out of 100 based on 18 critics, indicating "mixed or average reviews".[95]