- A giant thirty-five-foot shark becomes trapped in a SeaWorld theme park and it's up to the sons of police chief Brody to rescue everyone.
- Several years after Brody electrocuted the shark at Cable Junction, his sons, Mike and Sean, are now working in different roles at Sea World Orlando. Mike is working as a park engineer and considering marriage to his girlfriend, killer whale biologist Kathryn Morgan. Sean is also involved with 1 of the park's water skiers, Kelly Ann Bukowski. Sea World is about to open a massive 'Undersea Kingdom' which will bring visitors closer to marine life than ever before. The park is accessible from the ocean by a series of gates, one of which malfunctions. A young Great White Shark swims through the gate, and when a maintenance diver heads down to fix the gate he does not return. The young Great White is captured and placed in a tank but soon dies despite Kathryn's best efforts to save it. More alarming though, is the young shark's massive, 35 foot mother which has followed the baby shark into the lagoon and killed the maintenance diver, whose body is recovered. It isn't long before the huge shark begins wreaking havoc, and Mike and Kathryn, along with Sea World manager Calvin Bouchard and photographer Phillip Fitzroyce, must find a way to eliminate the shark before they - or the guests - become the shark's next meal.—Medic249a2
- With the grand opening of Florida's fantastic Sea World theme park just around the corner, a sophisticated attraction of Plexiglas tunnels and in-your-face underwater action, Amity's former Police Chief Martin Brody's sons, Michael and Sean, already have a lot on their plate. But, before long, after the recent massacre in Jaws 2 (1978), a stranded baby great white shark infiltrates the intricate system, and unsuspecting water-skiers and busy park employees become its first meal. Now, its mother, too, a swift, massive, 35-foot-long killing machine of razor-sharp teeth, is trapped in this all-you-can-eat buffet, and no one is safe. Is there an escape from the blood-stained Undersea Kingdom, and the jaws of the great white shark?—Nick Riganas
- Chief Brody's son Mike Brody is working at the SeaWorld, a thematic park owned by Calvin Bouchard that is ready to inaugurate the Undersea Kingdom complex, composed of underwater tunnels to see the life in the sea. Mike's girlfriend is the senior biologist Dr. Kathryn Morgan, who also works in the park. He is waiting for his brother Sean Brody that will spend a couple of days with them. Sean meets the skier Kelly Ann Bukowski in a bar and dates her. The park is located in a lagoon connected to the sea through a gate. While the gates are opened with a defect, a great white shark hides inside the lagoon and nobody notes. When the mechanic Shelby Overman repairs the gate, he is attacked by the white shark and dies. Finally, the inauguration day comes and the park is crowded with families. But the shark is on the loose in the lagoon.—Claudio Carvalho, Rio de Janeiro, Brazil
- This third film in the series follows a group of marine biologists attempting to capture a young great white shark that has wandered into Florida's Sea World Park. However, later it is discovered that the shark's 35-foot mother is also a guest at Sea World. What follows is the shark wreaking havoc on the visitors in the park.—Andrew Schaeffer
- Chief Martin Brody's older son, Michael (Dennis Quaid) now works for SeaWorld in Florida, which is preparing for the launch of its new "Undersea Kingdom," a set of tunnels where people can "view the wonders of the deep without ever getting wet." The film opens with a great white shark following a team of waterskiers, among them Kelly (Lea Thompson). Their boat stalls, but then its driver gets it going again before anyone is attacked.
Michael Brody is the chief engineer, and lives with his girlfriend, Katherine Morgan (Bess Armstrong), who is senior biologist at the park. Katherine and her assistants, Dan and Liz, wonder why the dolphins are afraid to leave their pen. As Sean (John Putch), Michael's brother, arrives to visit, he reveals a deep fear of the water (from events depicted in Jaws 2). Kelly, after meeting Michael, Sean, and Katherine in a bar, tries to dispel the phobia by playing in the water (mostly) naked at nighttime.
Meanwhile, Shelby Overman (Harry Grant), one of the mechanics, dives into the water at dusk to repair the gates. He is attacked by a shark and killed, only leaving a severed arm. The next morning, Michael and Katherine are informed of his disappearance by Charlene, a woman with whom Overman is living. She is quite irate at his failure to return, and fears the worst.
Michael and Katherine go down in a submarine to check the tunnels and find Overman's severed arm. They decide to go into a piece of scenery, the Spanish galleon, although encouraged by Katherine's two dolphins to stay away. They continue the search, leaving the submarine, only to be assaulted by a great white. The dolphins, having sensed trouble from the start and visibly beseeching Katherine to stay in the sub, respond to Katherine's waving hands. They heroically rescue Mike and Katherine by allowing them to ride them back to the safety of their dolphin pen.
This information is at first disbelieved by park owner Calvin Bouchard (Louis Gossett, Jr.) , but is quite exciting to his friend, the hunter Phillip FitzRoyce (Simon MacCorkindale). Katherine protests FitzRoyce's intent to kill the creature, so capturing it is the decided course. The baby great white is captured and nursed to partial health by Katherine and Liz. Before the shark can be put on display in the park, it must regain its strength -- Michael and Katherine keep it in a small holding pool. However, Calvin orders it exhibited as being the first Great White in captivity, but it dies within minutes.
Meanwhile, Kelly persuades Sean to join her on the bumper boats. While walking through of on the underwater tunnels, a girl is terrified when she sees a hideous corpse, revealed to be Overman, bob up to a window. Katherine reveals that the bites came from a shark with a mouth a yard across, which is initially ridiculed by FitzRoyce, saying "That would indicate a shark of some 35 ft. in length", which is too big for a normal great white. They surmise that the shark's mother has also breached the gates of the park, but she can't convince Calvin of this fact. The mother white is actually trapped in the intake tube of the park's water pump but escapes when it forces the gate open. The mother shark shows up at the window of their underwater cafe. The shark exacts her revenge, first by causing a leak that nearly drowns everyone in the underwater tunnel, then turns her attention to everyone on the beach. She fails to capture the waterskiers, but capsizes Sean and Kelly's bumper boat, and Kelly gets a laceration from the shark's coarse skin.
FitzRoyce leads the shark into the filtration pipes where the water from the ocean is brought into the lagoon, hoping to trap her inside. However, he drifts right into her mouth after his lifeline rope snaps. He prepares a grenade, but he is crushed to death before he can use it.
Unaware of FitzRoyce's death, Michael has gone down to repair the underwater tunnel so the technicians can restore air pressure and drain the water, with Katherine watching his back. He welds the repair piece, but, with no pressure in the pipe to restrain her, the shark breaks free of the filtration pipe and attacks Katherine again, but is protected by her dolphins. They return to the control room with Calvin and the technicians. The shark smashes through the acrylic glass, flooding the room. As everyone tries to escape, Mike notices FitzRoyce's body still inside the shark's mouth, clutching the grenade. Mike uses a pole to pull the grenade's pin, and it explodes, blowing the shark to pieces.
Katherine and Mike float up to the surface, explaining that Calvin managed to rescue the female technician, though the shark attacked the male technician and dropped him. Katherine is terrified for her dolphins, until they triumphantly show up in a splash, performing the tricks they refused to do since the movie's beginning.
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