August 1904: Finding themselves alone and having the run of the house, the junior servants indulge in a night of wild partying. When James, the Bellamy's son, show up unexpectedly, the party takes an unusual turn, causing Sarah to reevaluate her life. Unhappy with what she sees, she makes a monumental decision that will alter her course forever.
Jack Cassidy guest stars as professional model Hal Baxter, who comes to visit his brother Ted at WJM-TV. Immediately, the two engage in a heated battle of sibling rivalry about EVERYTHING -- salaries, cars, & even women. In an effort to size up his brother, Ted claims that Mary is his girlfriend. Ted & Hal decide to go on a double-date with Mary & Rhoda. At the restaurant, Ted doesn't know any etiquitte, and it shows. Back at Mary's apartment, Ted & Hal arm wrestle before Hal decides to go with Rhoda up to her apartment to look thru magazines for his picture. Ted stays with Mary to make Hal think that he spends more time with his girl than he does.
Danny runs into political intrigue when he discovers the dead body of a reporter, then can't find it until it turns up in a car crash hours later.
Danny is interested in the whales singing and tells the family they need to include whales in their act to show their support of ecology.
Convinced he doesn't have personality, Peter goes all out to try to get one. After imitating celebrities, Peter decides to try a funny personality in which he stocks up on jokes and plans to show his new personality off at a party.
The Goodies are asked to find Professor Knutts who went missing whilst leading an expedition to find the Lost Tribe of the Orinoco in 1951. They eventually find him - in Sevenoaks.
Hannibal Heyes and Kid Curry, two of the most wanted outlaws in the history of the West, are popular "with everyone except the railroads and the banks".
A psychiatrist finds himself falling for a mysterious woman whose last visitor was killed, so police conclude, by wild animals. A boy's fascination with snow begins to draw him into a beautiful fantasy world.
Samantha and Darrin are now in lovely Paree and Endora is home with Tabitha and Adam. Maurice comes by the house and finds out that the Stephens are vacationing in Europe. He is mad because they should have stopped by in London to see how he was doing. Endora flies to Paris to warn Samantha and then Maurice appears in a scary cloud of smoke. Out of rare kindness, Endora zaps up a fake Darrin who charms and pleases Maurice. Everything just seems all right until the real Darrin comes in. Maurice notices the trick and sends poor Darrin to the top of the Eiffel Tower. Unbeknownst to him, his very appearance there makes a perfect advertising campaign for one of his clients who runs a travel agency.
Young Vietnam veteran and marksman Billy Shem Jr. buys a rifle under false pretences and proceeds to a bunker at Diamond Head. He then takes pot shots at the people on the road and then the police who arrive. McGarrett must neutralise the threat he poses by any means possible.
A policeman is shot and killed by an assailant. The evidence points to the murderer being a local thief, currently enjoying a reign of terror in San Francisco, but soon the investigations lead elsewhere.
Ma Colter tries to dissuade her youngest son from following his older brothers into a life of crime.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
When Ida, Rhoda's mother, visits, she sees how well Phyllis and Bess get on, and how closely Mary appears to her mother when they chat on the telephone, that she tries to be Rhoda's ""friend"".
On the Stivic's first wedding anniversary, the family recalls the day Archie and Michael met.
Syndicate boss Delaney controls the waterfront and eliminates any potential witnesses - the IMF have 72 hours to bring him to justice before the grand jury closes. Barney infiltrates Delaney's waterfront organization and sabotages it, while Jim is a captain of a Norse ship, The Orion, on which Delaney once killed a man. Casey poses as the dead man's daughter and tries to implicate Delaney. The team capture Saunders, Delaney's killer, and Barney then claims to be employed by Delaney's Syndicate liaison Morgan and forces Saunders to set up a meeting on-board the Orion. Saunders ""escapes"" and warns Delaney, and they kill Morgan. The Syndicate head Mr. C is also present, lured to the ship, and witnesses the killing. He leaves one of his men to kill Delaney but the police arrive and Delaney testifies in return for protection.
Danny's sore throat is diagnosed as tonsillitis and he has to have his tonsils removed. He is nervous about the operation, and when it is over, he is nervous about losing his voice.