Hawaii Five-O (1968 TV series) season 1

Stephen Aloysius "Steve" McGarrett (Jack Lord) is embroiled in a tale of espionage and murder in this story, which marks the first appearance of villain Wo Fat (Khigh Dhiegh). Andrew Duggan, Leslie Nielsen, Soon-Tek Oh, Nancy Kwan and Lew Ayres guest star.

NOTE: Tim O'Kelly as Danny "Danno" Williams. Mitzi Hoag as McGarrett's secretary, May. First time McGarrett says "Book 'em"

The governor of Hawaii assigns McGarrett to break a ring of con artists swindling/killing visiting rich widows. Kevin McCarthy, Louise Troy, Arlene McQuade, June Dayton and Patricia Smith guest stars.

NOTE: First appearance of James MacArthur (as Danny "Danno" Williams), Richard Denning (as the governor), Maggi Parker (as McGarrett's secretary, May) and Peggy Ryan (as the governor's secretary, Mildred). Ryan would appear as McGarrett's new secretary, Jenny Sherman, from Seasons 2 to 8. Herman Wedemeyer also guest stars.

An official's death involves strange clues, including a woman with a camera and a man with a briefcase. Simon Oakland and Milton Selzer guest stars.

A publicity stunt by a rock singer (Sal Mineo) to stage his own kidnapping backfires when ransom is offered. Harold J. Stone and Sam Melville (actor) guest stars.

McGarrett must protect an underworld kingpin (Ricardo Montalbán) he is trying to convict of racketeering activities.

The Five-O team works overtime when Danny is indicted for the murder of an apparently unarmed teenage boy. Gavin MacLeod, Luana Anders, Danny Kamekona and Charlotte Stewart guest star.

NOTE #1: Edward Tom (uncredited) appears as Che Fong.

NOTE #2: The evidence shows Danny fired his gun at a closed door lock with the armed suspect out of sight so Danny would have been acquitted as he was firing to break the door lock and was not firing with malice at the suspect. The sequel to this episode comes in Episode 22 of Season 3, titled "The Bomber and Mrs. Moroney".

The owner of a tuna boat uses his craft to smuggle gold bars into the islands. This episode contains the first use of McGarrett's three-word catchphrase, "Book 'em, Danno". Marj Dusay, Kaz Garas and Paul Richards guest star.

NOTE: Richard Denning appears as Philip Grey, a U. S. Treasury agent.

McGarrett goes under cover in a California prison to find the connection between a girl's death and the theft of a gem collection. Don Knight guest stars.

A no-talent singer (Tommy Sands) turns to cat burglary when his musical efforts fail to satisfy his mounting gambling debts.

A U.S. serviceman, in Hawaii for R&R, becomes a pawn in a fight for control of a numbers syndicate. The head of the outfit is killed and the serviceman has been framed for it. Five-O races to solve the killing, shut down the numbers syndicate and prevent the serviceman from becoming the next homicide victim. Johnny Crawford, Anne Helm, Will Kuluva, Jonathan Goldsmith, Randall Duk Kim, Richard Benedict, Herman Wedemeyer guest star.

While searching for the killer who critically wounded Steve, Danny foolishly tips his hand to the killer (John Larch) when he questions the suspect's wife instead of staking out her home.

Five-O fights to save the life of a gangster (Nehemiah Persoff) so that he can testify against his boss (James Shigeta).

When a young Indonesian student is murdered, McGarrett searches for the prime suspect.

NOTE: Danny Kamekona appears as Che Fong.

A Marine Vietnam veteran (Yaphet Kotto) suffers a breakdown and, believing he is back in Vietnam, takes Danny hostage in a hospital ward, and Steve is willing to risk the lives of everyone in the ward to save him.

McGarrett attempts to get the goods on David Stone (Ed Flanders), a professor-turned-guru who introduces young people to drugs, but does not use them himself.

A man carrying bubonic plague arrives in the islands the same time as plans for a top-secret weapon vanish. David Opatoshu, Nancy Kovack, Soon-Tek Oh, Herb Jeffries, Jackie Coogan, Victor Sen Yung guest star.

McGarrett offers himself as a hostage in an attempted prison break by two "lifers". Gavin MacLeod, R. G. Armstrong, Gerald S. O'Loughlin, Eddie Sherman and Dan Leegant guest star.

Five-O receives an anonymous letter promising to go on a killing spree. Jeanette Nolan, Farley Granger and Paul Collins guest star.

A successful young boxer is murdered, and McGarrett has to find the murderer before the grieving father (a policeman himself) does. Jessie White, Peter Mark Richman, Jean Hale, Hal Baylor, Charles Lampkin and Frank de Kova guest star.

McGarrett travels to Los Angeles to help his sister (Nancy Malone) deal with her child's cancer and make the correct decision about a quack (Joanne Linville).

McGarrett continues his quest to put an end to the quack.

NOTE: Other than the pilot, this is the only non-season 12 episode in which James MacArthur does not appear.

A murder rocks a tight-knit group of left-wing hippies running Peace magazine. Law and order triumphs. Stewart Moss, Lee Paul, Ann Prentiss guest star.

McGarrett goes undercover as a safe-cracker to join a gang planning a robbery at sea, with a mastermind who delivers instructions by tape. Gerald S. O'Loughlin, Antoinette Bower, Than Wyenn, Eddie Dew guest star.

NOTE: Going by production order, this is the back story of Carl Swanson portrayed by Gerald S. O'Loughlin which concludes in Episode 17 ("The Box").

A beloved prominent Hawaiian believes he is being haunted by a malevolent spirit. John Marley, Sally Kellerman, and Robert Colbert guest star.