Slave driver Drysdale meets his secretary's burly brother.
Dr. Kline's deadly toxin is lost, he is having second thoughts about his plan, and McGarrett has to find the vial before it disintegrates and poisons the whole island. Already the toxin is doing its deadly work as innocent people come into contact with it.
In this environmental narrative Broson takes a bike trip in the ""Los Padres National Forest"" and runs into trouble after his motorbike falls down an embankment. Bronson decides to ride out of the forest by following the contour of the terrain. In the process, the trip imbues Bronson with a deep respect for nature and the environment.
Beau Graves is released from prison after the trio put him there two years ago. Pete is trying to decide whether or not to quit the trio and work for his dad. Flashbacks to previous episodes after Linc is shot make it clear to everyone the importance of their ""family"".
Tony causes general Schaeffer to lose an important pool match and breaking his hand later on so it seems he can't play in a rematch. Tony then must play for him with the aid of Jeannie.
With Matt out helping the Army deliver a gold shipment, Dodge is wide open for Morgan and his men to come in with a Gatlin gun and take over. Breaking into the Long Branch, Morgan is helping himself to whiskey when Kitty shoots him hitting him in the shoulder and the face. With Matt and the gold on the way and Morgan sitting with a big gun and a fever and a crazy streak from the permanent scar he's gonna have, Dodge can only wait to see what comes next.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
En route to San Francisco, actress Lotta Crabtree arrives in Virginia City for a special performance. Hoss is smitten by the beautiful actress, which makes her leading man jealous. When he is killed during a performance, Lotta and then Hoss are suspected of the death. It is up to Ben to set things straight.
The Earthlings aid an injured puppeteer by pretending to be his dancing puppets, but the owner soon suspects they are involved and prepares to capture them for the reward.
Worried about the Old Silurian's growing friendship with the Doctor, the Young Silurian has the scientist infect Baker with a virus and then release him.
Marcia's sense of security is shattered when Cindy inadvertently gives away her diary to a book collection. Marcia is especially concerned since in it, she confessed a secret desire for Desi Arnaz, Jr.
With the help of a singer, Hogan schemes to prevent the Gestapo from arresting all the local Allied agents.
The Cannon family runs the High Chaparral Ranch in the Arizona Territory in 1870s.
Max and the Chief investigate a series of security leaks that seem to be connected to a chain of spas.
Young Sister Bertrille uses her ability to become airborne to help others, whether they want it or not. Although her aims are always benevolent, her means are often bemoaned by Mother Superior. The other Sisters must cope with their beloved Sister's aerodynamics and antics as she flies in and out of trouble.
Ironside becomes trapped in his office on his own, when a man comes looking for revenge. With Mark at school and Ed dragged to the opera by Eve, the Chief has to improvise a series of defences, whilst his team gradually come to realise that something is very wrong.
When Granny induces Jed, Elly, and Jethro to move into the nostalgic old cabin, Shorty Kellems exploits the now-unoccupied mansion.
Dr. Alexander Kline, a biological scientist, views his work as evil, and to prove it, he plans to unleash a deadly germ that would kill thousands. Three dead cows lead McGarrett on a desperate chase to track down the toxin, involving a friendly telephone operator and top Washington agents.
Harve Traine, publisher of the ""The Pacific Grove Press,"" warns the community in a series of editorials about the ecological havoc industrial pollution is causing the local bay and surrounding ocean. Parochial financial concerns who advertise with Harve's newspaper, however, cause Harve serious emotional hardship and a potential financial disaster. Harve's daughter, Petey Traine, a writer for the paper, and Jim Bronson, both believe in the cause of the paper's editorials. Yet, does Harve stick to his editorial guns and face monetary ruin or does he acquiesce to the wishes of his advertisers and in the process loose the respect of his daughter?