Jack Lord
— Det. Steve McGarrett
Nancy Kwan
— Rosemary Quong
Leslie Nielsen
— Brent
Andrew Duggan
— Miller
James Gregory
— Jonathan Kaye
Khigh Dhiegh
— Wo Fat
Lew Ayres
— The Governor
Tim O'Kelly
— Danny
Newell Tarrant
— Doc
Zulu
— Kono
Kam Fong
— Chin Ho
Philip Ahn
— Attorney General
Mitzi Hoag
— May
Noah Keen
— Dr. Bernard
Russell Thorson
— Port Captain
Wright Esser
— Capt. Schroeder
Yankee Chang
— Tour Bus Driver
Iris Rainer
— Jailed Hippie Girl
Dale Ishimoto
— Arcturus Construction Guard
Soon-Tek Oh
— Wo Fat's Lab Technician
Mark LeBuse
— Arcturus Construction Foreman
Maxine Jennings
— Mildred - Governor's Secretary
Bill Saito
— Burglar
Gertrude Flynn
— Landlady
Baird Miller
— Agent Tailing McGarrett
Richard Kuga
— Wo Fat's Lab Assistant
William Boyett
— Agent in Brent's Office
Helen Torco
— Hula Dancer