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.

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.

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 ...