Hawaii Five-0 is an American action police procedural television series, which premiered on Monday, September 20, 2010 on CBS. The series is a reboot of the original series, which aired on CBS from 1968 to 1980. Like the original series, the show follows an elite state police task force which is set up to fight major crimes in the state of Hawaii. The series is produced by K/O Paper Products and 101st Street Television in association with CBS Productions, originally an in-name-only unit of but folded into CBS Television Studios, which has produced the series since the beginning of season three. On April 18, 2018, CBS renewed the series for a ninth season.
The series covers the actions of a small, specialized DPS task force in Hawaii, headed by Lt. Commander Steve McGarrett, USNR. The task force answers only to the Governor of the state of Hawaii and is given full immunity and means. The task force has no restrictions and is always backed by the Governor. The team is able to investigate crimes ranging from terrorism to kidnapping as well as murder and robberies. McGarrett chooses Honolulu PD Detective-Sergeant Danny "Danno" Williams as his partner and unofficial second in command of the team. He fills out the team by selecting HPD lieutenant Chin Ho Kelly, his father's protégé, and Chin's cousin, Kono Kalakaua, a rookie HPD officer. DHS Special Agent Lori Weston is also assigned to the team later on, although she is later forced to return to the DHS by the governor. They are assisted by Dr. Max Bergman, a medical examiner for the County of Honolulu, and Jerry Ortega, Chin's high school classmate and a conspiracy theorist. Steve later adds Lou Grover, a HPD SWAT commander, and for a brief time, Catherine Rollins, Steve's girlfriend and a former USNR lieutenant. Following Max, Chin, and Kono's departures, McGarrett fills in their spots by hiring high-achieving HPD academy washout Tani Rey, and later, Junior Reigns, a former Navy SEAL-turned-Police Candidate. The team is now assisted by Dr. Noelani Cunha as the medical examiner, along with two confidential informants: Kamekona Tupuola, and Kono's husband Adam Noshimuri, and Sergeant Duke Lukela, their HPD liaison.