Keith and Pamela elect to remain at the institute with Aphrodite, a dolphin in the final stages of a difficult pregnancy, as a Category 4 hurricane bears down on their island.

While suffering from nitrogen narcosis, Keith dreams that another scientist steals the credit for his echolocation transmitting device that enables Flipper to talk.

When sharks attack swimmers off a Florida island slated for a new resort hotel, Keith investigates and discovers that endangered fish species have been introduced to the area by a rival hotel owner.

Strange and dangerous mishaps start occurring after Bal Harbor University gets a new student---an ex-con whose brother Ricks helped put in jail. 

When Flipper's pal takes sick and beaches herself near the Institute, Keith and Pam race to find the source of the dolphin's illness.

Mike finds Maya living alone with no food or electricity; Sydney takes an unwelcome interest in the institute.

Upset and drunk after Maya spurns his advances, a reckless, rich boy is injured by a dolphin thought to be Flipper.

During Mike and Maya's visit to a restricted island, a monkey carrying a contagious virus stows away on their boat and returns with them to the institute, where it escapes and infects some of the staff---and Flipper. 

Mike and Maya befriend a surfer who intends to rob a wealthy potential patron of the institute.

Keith is forced into helping a black marketeer recover an old Soviet missile from the ocean floor.

Keith and Pam are endangered when they uncover an operation to use genetically engineered, rapidly reproducing oysters to create perfect pearls. 

Pam tries to help an amnesiac plane-crash victim using Flipper and Aphrodite for dolphin therapy.

Pam is deceived and endangered by an attractive woman who claims to be an underwater photographer. 

Pam's ex-husband arrives at the institute, causing Mike to hope for a reconciliation when he catches the two of them kissing.

Mike and Maya use a sub that Pam purchased at a police auction to search for a mysterious, iridescent green fluke.

Keith and brother Sandy track down "shark finners" -- people who slice the fins off live sharks for use in soup.

A reluctant Flipper performs for Cuban President Fidel Castro as Keith, Pam, Mike and Maya try to evade authorities in an attempt to free him.

Flipper is abducted by Keith Ricks' old fraternity brother to serve as the chief entertainment at a new Cuban resort hotel.

A tuna fisherman is framed for cruelly battering dolphins by an unfaithful wife and her scheming boyfriend.

Dr. Ricks, his friends and the Institute are threatened by an ecoterrorist.

An attack by pirates starts a headlong treasure hunt.

Dr. Pam Blondel, a U.S. Navy officer, is hired to join Dr. Ricks' dolphin research team, but her son isn't happy to be living in remote Bal Harbor.