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| Num Episodes: | 20 |
| Network: | CBS |
| Episode List: | List of Magnum, P.I. (2018 TV series) episodes |
The fourth season of the American crime and action drama Magnum P.I. premiered on October 1, 2021, on CBS, for the 2021–22 television season. It concluded on May 6, 2022. The series is a remake of the 1980 series of the same name and centers on Thomas Magnum, a former Navy SEAL who works as a private investigator and solves mysteries with his business partner Juliet Higgins and other friends. It stars Jay Hernandez, Perdita Weeks, Zachary Knighton, Stephen Hill, Amy Hill, and Tim Kang. The season was ordered on April 15, 2021, and consisted of twenty episodes. On May 12, 2022, it was announced that CBS had canceled the series after four seasons, however, on June 30, 2022, the series was picked up by NBC for a fifth and sixth seasons, consisting of twenty episodes. Dennis Chun appeared in the sixteenth episode of the season as his Hawaii Five-0 character in a minor crossover event. The season premiere, "Island Vibes", was watched by 5.23 million viewers.
See also: List of Hawaii Five-0 (2010 TV series) characters.
See also: List of Magnum, P.I. (2018 TV series) 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. Numerous episodes are named after similarly named episodes from the original series. "Production code" refers to the order in which the episodes were produced while "U.S. viewers (millions)" refers to the number of viewers in the U.S. in millions who watched the episode as it was aired.
Despite Hawaii Five-0 ending in 2020, Dennis Chun still made a guest appearance in the sixteenth episode of the season as his Hawaii Five-0 character, Honolulu Police Department Sergeant Duke Lukela, after making a guest appearance in all three previous seasons of Magnum P.I.[2]
On April 15, 2021, it was announced that CBS had renewed Magnum P.I. for a fourth season. This came following the announcement that MacGyver had been canceled after five seasons, leaving Magnum P.I. as the last remaining series in the Lenkov-verse.[3] The series' writers have confirmed that it will be a full season consisting of eighteen to twenty-two episodes,[4] later stating it will be twenty.[5] Christopher Duddy joined the series as the director of photography after previously doing the same job on MacGyver.[6] Multiple crew members left the series prior to the season to work on .[7] On May 12, 2022, CBS canceled the series after four seasons,[8] however, on June 30, 2022, the series was picked up by NBC for a fifth and sixth seasons, consisting of twenty episodes.[9]
On August 27, 2021, it was announced that Chantal Thuy had been cast in an undisclosed capacity as Lia Kaleo, an HPD detective who is Katsumoto's partner and Magnum's secret girlfriend.[10] On September 28, 2021, Martin Martinez was cast in a recurring role as Cade Jensen, a troubled teenager looking for a job at La Mariana who ends up bonding with T.C.[11] On December 30, 2021, it was reported that Levy Tran had been cast in a guest-starring role as Tia Min, a bodyguard for a powerful crime lord. Tran previously portrayed a different character as a series regular on MacGyver.[12] Christopher Thornton, Bobby Lee, and Jay Ali returned as Kenny "Shammy" Shamberg, Jin Jeong, and Ethan Shah, respectively, after being introduced in previous seasons.[13] [14] [15]
Filming for the season began July 20, 2021, with a traditional Hawaiian blessing. Filming concluded on March 9, 2022.[16]
In May 2021, it was confirmed that Magnum P.I. would keep the timeslot it held for previous two seasons of Fridays at 9:00 PM ET.[17] In July 2021, the season was revealed to be premiering on October 1, 2021. The series continues to lead into Blue Bloods and follows S.W.A.T. and Undercover Boss.[18] [19]