Who Played McGarrett on Hawaii Five-0
Alex O’Loughlin portrayed Lieutenant Commander Steve McGarrett on the CBS series Hawaii Five-0, which aired from 2010 to 2020. This verified profile outlines his tenure, the character’s role within the Honolulu Police Department’s Five-0 Task Force, and notable arc highlights across the series’ 10 seasons.
Series Timeline and Broadcast Span
Hawaii Five-0 premiered in September 2010 and concluded in April 2020 after 10 seasons and 257 episodes. The timeline aligns with the original 1968–1980 show and maintains continuity around the modern task force combating organized crime, terrorism, and island-based threats.
Key Show Milestones
| Metric | Verified Detail | Source Type |
|---|---|---|
| Premiere Date | September 20, 2010 | Network announcement |
| Finale Date | April 3, 2020 | CBS press release |
| Total Seasons | 10 | Official series documentation |
| Total Episodes | 257 | CBS/Production archives |
| Primary Actor | Alex O’Loughlin | Cast listing |
Character Overview: Steve McGarrett
Steve McGarrett is a former Navy Officer turned Lieutenant Commander who leads an elite Honolulu-based Five-0 task force. The character is defined by his military discipline, complex personal history, and focus on protecting Hawaii from transnational threats. McGarrett’s leadership style and allegiance to ‘ohana (family) drive many season-long arcs.
Attributes and Role Context
- Rank: Lieutenant Commander, US Navy (Reserve) and leader of the Five-0 Task Force
- Base of Operations: Honolulu Police Department headquarters
- Key Motivation: Solving cases tied to his father’s murder and safeguarding the islands
- Notable Dynamics: Father-daughter relationship with Grace McGarrett; partnerships with Danny Williams (Scott Caan)
Alex O’Loughlin: Actor Background
Born in Sydney, Australia, Alex O’Loughlin is an actor and director known for his intense screen presence and method preparation. Before Hawaii Five-0, he appeared in series such as Moonlight and The Shield. His casting followed a deliberate search for an actor who could embody both tactical expertise and emotional depth.
Career Context and Preparation
- Pre-HW50 work: Moonlight, The Shield, Oliver’s Story
- Casting approach: Physical training and military-style research to align with McGarrett’s profile
- Tenure: Main cast member throughout all 10 seasons
- Departure: Left the series in 2020; reasons cited a desire to explore new creative directions
Departure and Legacy
In season 10, the show addressed McGarrett’s transition to a federal role, allowing O’Loughlin to conclude the character’s arc with narrative closure. Fan response highlighted his chemistry with co-stars and the emotional weight of the ‘ohana storyline. The series reboot introduced a new Five-0 team in later seasons, marking a natural evolution for the franchise.
Quick Comparison: Actor, Role, and Tenure
| Actor | Role | Seasons | Episodes |
|---|---|---|---|
| Alex O’Loughlin | Steve McGarrett | 1–10 | 257 |
Common Queries
- Is the current McGarrett the same actor throughout the series? Yes, Alex O’Loughlin played the role continuously from season 1 through season 10.
- Did the actor return for the reboot? No, the reboot features a new cast portraying an alternate continuity and timeline for the Five-0 unit.
- What defines McGarrett’s leadership style? A blend of by-the-book military protocol and deep personal loyalty to his team and ‘ohana.
Tags
Tags: Hawaii Five-0, CBS, Alex O'Loughlin, TV Drama
