Hawaii Five-0 is a long-running police procedural that aired from 2010 to 2020. The series centers on the Five-0 Task Force, an elite Honolulu-based team that handles high-stakes criminal investigations. This guide details the principal cast, their characters, and the evolution across the show’s ten-season run. It also examines recurring figures who shaped key arcs. The show is a reimagining of the 1968 original, blending episodic crime cases with serialized character and conspiracy storylines tied to Steve McGarrett’s past.
Main Cast Overview
The main cast forms the operational core of the task force. Each principal actor portrays a character with distinct investigative roles, leadership responsibilities, and personal arcs. The team structure reflects partnership dynamics, command authority, and evolving loyalties. Below is a verified overview of the main cast members, their character names, seasons active, and narrative function within the series framework.
| Actor | Character | Seasons | Primary Role |
|---|---|---|---|
| Alex O'Loughlin | Steve McGarrett | 1–8 | Former Navy SEAL, Task Force Commander |
| Scott Caan | Danny Williams | 1–10 | HPD Detective, Veteran Investigator |
| Grace Park | Kono Kalakaua | 1–5 | Officer, Later Task Force Member |
| Daniel Dae Kim | Chin Ho Kelly | 1–10 | Former Sergeant, Task Force Member |
| Jade Barbosa | Jenna Kaye | 1–2 | Deep Cover Agent, Liaison |
| Masi Oka | Max Bergman | 1–8 | Medical Examiner, Forensic Specialist |
| Stephen Hill | Lance McCready | 1–2 | HPD Officer, Later Task Force Member |
| Taryn Manning | Mary Ann McGarrett | 3–4, 7–8 | Steve’s Sister, Occasional Task Force Involvement |
Steve McGarrett (Alex O'Loughlin)
Steve McGarrett, portrayed by Alex O'Loughlin, is the task force founder and leader. A former Navy SEAL, McGarrett returns to Honolulu after his father’s murder to investigate a conspiracy tied to his past. O'Loughlin’s performance anchors the procedural elements, with storylines focused on leadership burdens, moral conflicts, and his complex relationship with the team. He departs in season 8, and his eventual replacement reflects the show’s evolving command structure.
Danny Williams (Scott Caan)
Danny Williams, played by Scott Caan, is a sharp-witted, sarcastic HPD detective brought onto the task force for his investigative instincts. Caan’s portrayal emphasizes street smarts, loyalty, and a protective streak, particularly toward McGarrett and the team. He remains through the entire series, becoming the longest-serving main cast member and embodying the emotional continuity across seasons.
Kono Kalakaua and Chin Ho Kelly (Grace Park and Daniel Dae Kim)
Grace Park’s Kono Kalakaua begins as a rookie police officer recruited into the task force, bringing idealism and field skills. Daniel Dae Kim’s Chin Ho Kelly is a former HPD sergeant with deep local ties and investigative expertise. Both characters navigate themes of legacy, duty, and personal integrity. Park departs after season 5, while Kim stays through season 10, with Chin’s arc addressing professional redemption and family dynamics.
Supporting and Recurring Cast Members
The recurring cast expands the show’s narrative scope, introducing allies, antagonists, and figures from McGarrett’s past who influence ongoing conspiracies. These characters contribute to case-of-the-week plots while advancing season-long arcs related to Hawaii Five-0’s internal conflicts and external threats.
- Masi Oka as Max Bergman: Medical examiner and tech specialist active through season 8.
- Jade Barbosa as Jenna Kaye: Covert operative and early-season ally in seasons 1–2.
- Taryn Manning as Mary Ann McGarrett: Steve’s sister, involved in federal and personal storylines across multiple appearances.
- Stephen Hill as Lance McCready: Early team member whose role transitions across seasons 1–2.
- Dennis Chun as Duke Lukela: Airport officer turned confidential informant with steady presence across seasons.
- Kimee Balmilero as Dr. Noelani Cunha: Medical examiner who joins later seasons, extending forensic team continuity.
Leadership and Command Structure
Command authority within Five-0 shifts across the series due to departures, promotions, and reorganizations. Initially led by McGarrett, command transitions through several figures, reflecting narrative needs and cast changes. This section outlines the verified leadership timeline and the corresponding command hierarchy.
Command Roster by Season Blocks
| Season Range | Commander | Notes |
|---|---|---|
| 1–8 | Steve McGarrett | Founder and primary leader until departure. |
| 9–10 | Adam Noshimuri | Assumes command after McGarrett exits. |
| 1–4, 6–7 | Chin Ho Kelly | Serves as second-in-command and later field commander. |
| 5–6 | Lou Grover | Takes over after Chin’s reassignment in later arcs. |
Notable Departures and Cast Changes
Several main cast members departed during the series’ run, reshaping team dynamics. Grace Park and Masi Oka exited after season 5, reducing the core field unit. Stephen Hill and Taryn Manning made limited appearances, reflecting narrower story focus. These changes influenced episode structure and long-term plotting, often integrating new characters to preserve team functionality.
Departure Timeline and Replacements
- Grace Park (Kono) leaves after season 5; offscreen explanation cites federal witness protection.
- Masi Oka (Max) exits after season 8; character written out following medical role conclusion.
- Jade Barbosa and Stephen Hill appear primarily in early seasons, with sporadic returns.
- Taryn Manning’s appearances are confined to specific story arcs across seasons 3, 4, 7, and 8.
Recurring Characters and Their Impact
Recurring characters extend beyond the main unit, providing continuity across seasons and connecting episodic plots to larger conspiracies. These figures include allies, bureaucratic contacts, and antagonists whose motives tie to Steve McGarrett’s father’s murder and related investigations.
- Jerry Ortega: Intelligence analyst and McGarrett’s longtime ally, portrayed by Jorge Garcia.
- Dr. Max Bergman: Masi Oka’s character serves as both medical examiner and emotional anchor.
- Governor Pat Jameson: Richard T. Jones’s portrayal links political intrigue to task force operations.
- Wo Fat: The primary antagonist across multiple seasons, central to the conspiracy arc.
- Adam Noshimuri: Ian Anthony Dale’s character becomes a key figure in later-season command transitions.
Comparative Context: Continuity and Cast Evolution
Compared to its 1968 predecessor, the 2010 version invests heavily in serialized character development alongside case-based storytelling. The main cast provides consistent leadership while recurring figures introduce variable team compositions. This structure supports both standalone episodes and long-form narrative arcs, contributing to the series’ ten-season longevity.
Current Availability and Franchise Status
As of its conclusion in 2020, Hawaii Five-0 remains a widely syndicated property, with streaming availability across major platforms. All ten seasons are accessible, and the series continues to attract new viewers through reruns and on-demand services. The cast’s ongoing public engagement supports the franchise’s enduring recognition.