Flipper helps Sandy and Bud search for stolen jewels when Ranger Porter Ricks is charged with robbery and hauled off to jail.
Mike Nelson accepts a job to supervise a diamond diving expedition in South America but soon rebels when he learns his employers are poaching on somebody else's property.
When the State of Florida is plagued with a series of underwater crimes, Mike Nelson is called to organize and train an underwater police force.
Flipper is forced to fight starving alligators after being kidnapped by two inscrupulous film makers who record the battle on camera.
