Guest Stars Chris Mulkey as William Pettifer Richard Herd as Milton Cooper Co Starring Ma'a Tanuvasa as Guard Mariano Farrar as Clarence Whitmour Daisy Kim Murakami as Yuki Uncredited Scott Caan as Milton Cooper - 1941 Alex O'Loughlin as Steven McGarrett Sr - 1941 Meaghan Rath as Alexa Alana Chi McBride as Capt. Charles Sumner Ian Anthony Dale as Earl Blackstone Taylor Wily as "Biggie" Tupa Jorge Garcia as Officer Mike Flanagan Beulah Koale as Evan Kekoa Dennis Chun as Sgt. Naskiuchi