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 Dennis Chun Sgt. Duke Lukela Actor Ian Anthony Dale Adam Noshimuri Actor Beulah Koale Junior Reigns Actor Andrew Lawrence Eric Russo Guest Star Laura Mellow Nalani Lukela Guest Star Cidni Romias Akela Nakahara Guest Star Eric Steinberg Captain Keo Guest Star Joshua Gonzalez Young Jerry Guest Star Mary Lynn Rajskub Crystal Guest Star Jade Heimowitz Young Crystal Guest Star Michael Spellman Gordie Guest Star Luke Bagley Young Gordie Guest Star Derek Basco Ano Guest Star Kai Murata Young Ano Guest Star Carly J. Casey Emily Cass Guest Star Ashley Chewning Jane Martin Guest Star Noah Moore Counselor Blaine Morgan Guest Star Gregory Suenaga HPD Uni. Officer Singer -- 1982 Guest Star Pat Gilbert Bo Bradley Guest Star Claudia Elmore Kalei Iosia Guest Star Jaycee Cryan-Cadiente Molly Guest Star Saini Tuimaunei Katie Guest Star David Bertin Greene Travis Iosia Guest Star Jay Hector Boyfriend -- 1980 Guest Star Olivia Jordan Girlfriend -- 1980 Guest Star Chelsea Davis Reporter Guest Star Peter M. Lenkov Executive Producer Alex Kurtzman Executive Producer Roberto Orci Executive Producer Eric Guggenheim Executive Producer Zoe Robyn Writer Sean O'Reilly Writer Elizabeth Allen Rosenbaum Director