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 Mark Dacascos Guest Star Cary-Hiroyuki Tagawa Guest Star Alvin Harrington Guest Star William Maeda Guest Star Michael Hsia Guest Star Augie Tulba Guest Star Alex Kurtzman Executive Producer Roberto Orci Executive Producer Peter M. Lenkov Writer Nicole Ranadive Writer Brad Turner Director