<P> 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 March 23, 2017, CBS renewed the series for an eighth season which premiered on September 29, 2017 . </P> <P> 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 . The team is now assisted by Noelani Cunha as the medical examiner . The team also assisted by two confidential informants: Kamekona Tupuola, and Kono's husband Adam Noshimuri, as well as Duke Lukela, their HPD liaison and Junior Reigns, a Police Candidate and former Navy SEAL, who is determined to join the team . </P> <Ul> <Li> Alex O'Loughlin as Lieutenant Commander Steven J. "Steve" McGarrett, USNR . A decorated former Navy SEAL, McGarrett is head of the Five - 0 Task Force and son of retired HPD Sergeant John McGarrett . John's murder and storyline forms the premise of Steve's return to Hawaii and the formation of the Task Force . </Li> <Li> Scott Caan as Detective Sergeant Danny "Danno" Williams, HPD . He is a divorced single father who transferred from Newark PD in New Jersey to be with his daughter and is the de facto second - in - command of Five - 0 . </Li> <Li> Daniel Dae Kim as Detective Lieutenant Chin Ho Kelly, HPD (seasons 1--7). A veteran HPD detective, he was John McGarrett's former rookie and provides technical expertise and local know - how . Kim departed the series in late June 2017 prior to the start of production of the eighth season due to a salary dispute with CBS . Kim had been seeking pay equality with co-stars Alex O'Loughlin and Scott Caan, but CBS's final offer to Kim was 10--15% lower than what O'Loughlin and Caan make in salary . </Li> <Li> Grace Park as Officer Kono Kalakaua, HPD (seasons 1--7). A former surfer, she was personally recruited by McGarrett while still in her final days at the HPD Academy . She is the cousin of Lieutenant Kelly . Park departed the series in late June 2017 prior to the start of production of the eighth season due to a salary dispute with CBS . Park had been seeking pay equality with co-stars Alex O'Loughlin and Scott Caan, but CBS's final offer to Park was 10--15% lower than what O'Loughlin and Caan make in salary . </Li> <Li> Taryn Manning as Mary Ann McGarrett, (season 1; recurring subsequently) Steve's sister who lives on the mainland and occasionally visits Hawaii . </Li> <Li> Masi Oka as Dr. Max Bergman (seasons 2--7; recurring previously), the eccentric and well - respected County of Honolulu medical examiner . </Li> <Li> Lauren German as Special Agent Lori Weston (season 2; guest previously). A senior DHS agent assigned to Five - 0 to provide oversight . </Li> <Li> Michelle Borth as Lieutenant Catherine Rollins, USNR (seasons 3--4; recurring previously and subsequently). A former Navy Intelligence officer and McGarrett's ex-girlfriend . </Li> <Li> Chi McBride as Captain Lou Grover, HPD (season 4--present; recurring previously). A transfer from Chicago PD and has two children with his wife Renée . </Li> <Li> Jorge Garcia as Jerry Ortega (season 5--present; recurring season 4), a conspiracy theorist who assisted Five - 0 during several investigations and is eventually hired as a "consultant". </Li> <Li> Meaghan Rath as Officer Tani Rey (season 8), whom McGarrett recruits from her job as a hotel pool lifeguard after being kicked out of the police academy, despite being a first - rate candidate . She initially declines to join but later joins as a team member . </Li> <Li> Taylor Wily as Kamekona Tupuola (season 8; recurring previously), a rehabilitated ex-convict, turned entrepreneur and owner of the Waiola Shave Ice, Kamekona's Shrimp Truck, and Kamekona's Helicopter Tours . He is a CI for the Five - 0 Task Force and their friend . </Li> <Li> Dennis Chun as Sgt . Duke Lukela (season 8; recurring previously), HPD officer who often acts as a liaison to Five - 0 . He was one of the few HPD cops who was not antagonistic towards Danny or the other Five - O members from the beginning, as he was colleagues with Steve's father and also personally knew Chin and Kono's family . In "Hookman", he was shot by Curt Stoner (Peter Weller), but survived and recovered . Chun is the son of Kam Fong Chun, who played Chin Ho Kelly in the original series . </Li> <Li> Kimee Balmilero as Dr. Noelani Cunha (season 8; recurring previously), a medical examiner who took over to assist the team after Max's departure . She is often seen joining in with the team during holidays and celebrations . </Li> <Li> Beulah Koale as Junior Reigns Five - 0 Task Force (season 8), a former Navy SEAL who asks McGarrett, a fellow SEAL, for a job . Initially turned down he returns to McGarrett a second time . McGarrett later introduces him to Duke Lukela and informs him that before becoming a member of Five - 0 he will need to join and finish the Police academy . </Li> <Li> Ian Anthony Dale as Adam Noshimuri (season 8; recurring previously), Kono's husband, and a confidential informant to Five - 0 . </Li> </Ul> <Li> Alex O'Loughlin as Lieutenant Commander Steven J. "Steve" McGarrett, USNR . A decorated former Navy SEAL, McGarrett is head of the Five - 0 Task Force and son of retired HPD Sergeant John McGarrett . John's murder and storyline forms the premise of Steve's return to Hawaii and the formation of the Task Force . </Li>

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