Alex O'Loughlin Steve McGarrett Actor Scott Caan Danny "Danno" Williams Actor Chi McBride Lou Grover Actor Jorge Garcia Jerry Ortega Actor Meaghan Rath Tani Rey Actor Taylor Wily Kamekona Actor Kimee Balmilero Dr. Noelani Cunha Actor Beulah Koale Junior Reigns Actor Kunal Sharma Koa Rey Guest Star Jennifer Fairbank Leili Kahula Guest Star Dohn Norwood Ronnie Turner Guest Star Ricardo Antonio Chavira Agent Callahan Guest Star Danay Garcia Elena Sachs Guest Star Chris Flanders Norman Andrews Guest Star Romualdo Castillo Guillermo Guest Star Noah Khan Tomas Sachs Guest Star G. Allen Gumapac Jr. Natano Reigns Guest Star Alex Fox Isaiah Phillips Guest Star Peter M. Lenkov Executive Producer Alex Kurtzman Executive Producer Roberto Orci Executive Producer Eric Guggenheim Executive Producer Liz Alper Writer Ally Seibert Writer Ron Underwood Director