Salty acts very withdrawn, leading everyone to believe that he is jealous of a visiting sea lion.

Taylor is suspected of looting sunken treasure when a bag of artifacts is found on his skiff. 

A young girl and her boy friend plot to steal a plaque that has value only to its owner. 

With business in the marina at a standstill, Taylor and Tim do odd jobs to help Clancy pay the bills. 

An animal dealer wants to buy Salty for a circus and when he is refused, accidents begin to happen. 

Tim sets out in search of hidden treasure after finding a good-luck charm. 

Salty is caught by a fisherman who refuses to release his new possession. 

The story of how Taylor and his withdrawn younger brother Tim came to settle on the island is told in this episode. 

While Taylor shows the beauties of the underwater depths to his friend Dr. Mendoza, Clancy receives the visit of his sister Betsy, who has arrived unexpectedly ...

In his rush to bring insulin to a stranded diabetic, Tim takes the wrong boat, and runs out of gas midway with no radio to signal for help. 

A search for some new tropical fish starts innocently enough, but then food poisoning strikes, and when Salty is sent for help, he ends up in a poacher's net.

Three bank robbers hold Rod hostage while they wait for his father to ransom him. 

A marine biologist's work is hindered by two jewel smugglers who are trying to keep her away from the water. 

A man who believes in nature's healing powers may witness his daughter's final hours, unless he allows a doctor to examine her. 

A ruthless college professor uses Salty as a subject for an experiment to secure tenure for himself. 

Clancy's college sweetheart has come to the island with hopes of persuading him to join her law practice in New York. 

A shady businessman is putting heavy pressure on Clancy to sell the marina. 

Salty takes the boys to a seemingly deserted lighthouse, where they befriend an eccentric old man who is adamant about keeping his location a secret.

An outing for Tim and Rod turns into an entrapment in an abandoned house on a deserted island.

Taylor is sure that the arrival of his Aunt Cleo means that his younger brother will be taken on a whirlwind flight through life. Aunt Cleo has an adventurous outing when she joins Tim on a nautical picnic.