Alex O'Loughlin Steve McGarrett Actor Scott Caan Danny "Danno" Williams Actor Daniel Dae Kim Actor Grace Park Actor Masi Oka Guest Star Larisa Oleynik Guest Star Mark Dacascos Guest Star James Ransone Guest Star Perrey Reeves Guest Star Matty Liu Guest Star Aimee Zannoni Guest Star Susan King Guest Star Ethan Carter Guest Star Nicholas Masciangelo Guest Star D.B. Sweeney Guest Star Christopher Sapsis Guest Star Kasim Saul Guest Star Don Nahaku Guest Star Cecilia Brown Guest Star Kristina Waiau Guest Star Peter M. Lenkov Executive Producer Alex Kurtzman Executive Producer Roberto Orci Executive Producer J.R. Orci Writer David Wolkove Writer Matt Earl Beesley Director