As SeaWorld, a water park with underwater tunnels and lagoons, prepares for opening, a young great white shark infiltrates the park from the sea, seemingly attacking and killing water skiers and park employees. Once the baby shark is captured, it becomes apparent that it was the mother, a much larger shark who also entered the park, who was the real killer.
The film is notable for making use of 3-D film during the revived interest in the technology in the 1980s, amongst other horror films such as Friday the 13th Part III and Amityville 3-D. Cinema audiences could wear disposable cardboard polarized glasses to create the illusion that elements penetrate the screen. Several shots and sequences were designed to utilise the effect, such as the shark's destruction. Since the 3-D is ineffective in home viewing, the alternative title Jaws III is used for television broadcasts, VHS and DVD.