Alex O'Loughlin Steve McGarrett Actor Scott Caan Danny "Danno" Williams Actor Daniel Dae Kim Actor Grace Park Actor Taryn Manning Actor Jean Smart Guest Star Masi Oka Guest Star Michelle Borth Guest Star Kyle Secor Guest Star Jacqueline McKenzie Guest Star Wood Harris Guest Star Jennifer Knight Guest Star Duke Kenney Guest Star Daryl Bonilla Guest Star Cyrus Legg Guest Star Johnnie M. Purvis Guest Star Deane P. Leong Guest Star Patrick Gallagher Guest Star Jacqueline Frederick Guest Star Marcus Briggans Guest Star Beulah Koale Junior Reigns Actor Chi McBride Lou Grover Actor Katrina Law Quinn Liu Actor Taylor Wily Kamekona Actor Dennis Chun Sgt. Duke Lukela Actor Kimee Balmilero Dr. Noelani Cunha Actor Peter M. Lenkov Executive Producer Alex Kurtzman Executive Producer Roberto Orci Executive Producer J.R. Orci Writer David Wolkove Writer Brad Turner Director Tate Donovan Director