Magnum P.I. is an American action television series developed by Peter M. Lenkov and Eric Guggenheim. It stars Jay Hernandez as Thomas Magnum, the titular private investigator and former Navy SEAL who solves crimes in Hawaii. It is a reboot of the 1980–88 television series of the same name created by Donald P. Bellisario and Glen A. Larson. The series co-stars Perdita Weeks, Zachary Knighton, Stephen Hill, Amy Hill, and Tim Kang.

It was ordered to series in May 2018, and premiered on September 24, 2018, on CBS. On October 19, 2018, it was announced that the series had received a full season order from CBS. In April 2021, the series was renewed for a fourth season, which premiered on October 1, 2021. Despite being a Top 25 show in viewers, in May 2022, the series was canceled after four seasons, following CBS's failure to reach a new agreement with rights holders CBS Studios and Universal Television. On June 30, 2022, the series was picked up by NBC with a two-season, twenty-episode order, later clarified to be produced and broadcast as a two-part fifth season. The fifth season premiered on February 19, 2023. In June 2023, it was announced that the fifth season would be the final season. The series ended on January 3, 2024.

Magnum P.I. takes place in the same fictional universe as two other series, both also developed by Lenkov and both also reboots of earlier crime shows: Hawaii Five-0 and MacGyver. The three shows have been collectively referred to as the "Lenkov-verse". Initially, the series aired on Monday nights at 9:00 p.m., but aired its latter three CBS seasons on Friday nights in the same timeslot, immediately followed by Blue Bloods starring Tom Selleck, who portrayed the title character from the original series.

Premise Similar to the original series, Magnum P.I. revolves around the titular ex-United States Navy SEAL, Thomas Magnum, who occupies the guest house on Robin's Nest, the Hawaiian Estate owned by famous author Robin Masters. In exchange for allowing Magnum to live in his guest house, Masters writes a fictional book series about a "white knight" centered around Magnum's time in the military. In addition, Magnum works for Masters as a security consultant; despite this, Masters never appears in the series. Also living on the estate are Juliet Higgins, an ex-MI6 agent who serves as the estate's majordomo, and native Hawaiian Kumu Tuileta, who is the estate's cultural curator. Magnum's living arrangement gives him access to the guest house and Masters' Ferrari 488 Spider but does not come with a salary, so he solves crimes as a private investigator. His investigations often include Higgins, who officially joins him as his partner in the second season. The two are frequently assisted by ex-United States Marines, Orville "Rick" Wright and Theodore "T.C." Calvin. Rick is now a bar owner, while T.C. is a pilot whose main business is running helicopter tours of the islands. Gordon Katsumoto is a detective for the Honolulu Police Department (HPD) who frequently disagrees with Magnum's investigative methods, but nonetheless respects his crime-solving expertise.

Despite both having serious relationships throughout the first four seasons, Magnum and Higgins often share sexual tension with each other, which is finally addressed in the fourth season finale. Rick also finds himself in a serious relationship in the latter half of the series, leading to his girlfriend giving birth to their child. Meanwhile, the divorced Katsumoto often faces trouble with his son, and T.C. becomes a father figure to a homeless teenager in the fourth season.

The show shares a direct fictional universe with Hawaii Five-0. The six main characters of Magnum P.I. share many allies with the Five-0 Task Force, including further law enforcement professionals, confidential informants, and city employees.

Cast

Main 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

Recurring 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 (seasons 4-5) Michael Delara as Gabriel Santos/M.E. Tech (season 4) Michael Rady as HPD Detective Chris Childs (season 5) Emily Alabi as Mahina (seasons 4-5) Rayan Lawrence as Neil (season 4)

Crossover characters from Hawaii Five-0 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)

Episodes

Production Development 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. John Davis and John Fox of Davis Entertainment were reported as additional executive producers. CBS Television Studios and Universal Television co-produced the series. Danielle Woodrow was also later announced to be serving as an executive producer. The series was initially picked up by CBS for thirteen episodes, and an additional seven episodes were later ordered. On January 25, 2019, Magnum P.I. was renewed for a second season along with two other CBS freshman series. 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. Guggenheim also returned as executive producer and co-showrunner. It was later revealed that the second season would consist of twenty episodes.

On May 6, 2020, CBS renewed the series for a third season, along with eighteen other television shows. 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. He was originally expected to continue work on the series throughout the season as part of the previously signed deal. Lucas Till who portrays the title character of Angus MacGyver on MacGyver stated that Lenkov made him suicidal and constantly body shamed him. Lenkov's lawyers initially denied all allegations. 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." Lenkov still received writing credits for various episodes throughout the season written prior to his termination. Gene Hong replaced Lenkov as co-showrunner joining Guggenheim who continued working on the series. 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. On April 15, 2021, CBS renewed the series for a fourth season, which premiered on October 1, 2021.

Casting 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. Perdita Weeks was cast as Juliet Higgins on March 2, 2018. The character of Higgins was genderswapped, from their 1980 counterpart Jonathan Higgins. Lenkov and 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. Zachary Knighton and Stephen Hill were later cast as Orville "Rick" Wright and Theodore "T.C." Calvin, respectively. Tim Kang and Amy Hill were the last two to be cast in the series, as Detective Gordon Katsumoto and Kumu, respectively.

Kimee Balmilero, Taylor Wily, and Dennis Chun all appeared as their Hawaii Five-0 characters throughout the first season. Chun guest starred on the original Magnum, P.I. as various minor characters throughout its run. Domenick Lombardozzi, Ken Jeong, and Christopher Thornton were cast in recurring roles. Actor and former football player Carl Weathers, MLB baseball player Christian Yelich, and NASCAR driver Ryan Blaney all appeared as guest stars. Betsy Phillips, series star Zachary Knighton's wife, first appeared in the second season's final episode.

Christopher Thornton continued to recur throughout the second, third, and fourth seasons. Bobby Lee was introduced as a new recurring character in the second season and also returned for guest appearances in the third and fourth. 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. Patrick Monahan, Skyler Grey, and Jerry Becker, appeared as themselves in season two and performed as their real world band Train.

Balmilero, Wily, and Chun also made appearances throughout the second season as their Hawaii Five-0 characters. 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.

Larry Manetti and Roger E. Mosley, who co-starred in the original Magnum, P.I., made guest appearances on the reboot. However, Tom 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.

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. It was later revealed that Lance Lim would also recur in the third season. Mosley again returned as a guest star in the third season. Balmilero, Chun, and Garnett from Hawaii Five-0 continued appearances in the third season despite Hawaii Five-0s cancellation.

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

Filming