Sandy is distraught when, having saved Flipper by pulling out a spear, his father insists the dolphin be released. A grateful Flipper, however, returns the favor when Sandy is threatened by Sharks.
Boy Sandy and Dolphin Flipper are in the Bahamas where they pester a bunch of outlaws holding an English family captive.
An anthropologist and his family are shipwrecked on a South Seas island.