Watch Piranha 3D Online. Fisherman Matthew Boyd (Richard Dreyfuss) is fishing in Lake Victoria when a small earthquake hits, splitting the lake floor and causing a whirlpool. Boyd falls in and is ripped apart by a school of prehistoric piranhas.

Jake Forester (Steven R. McQueen) is admiring attractive tourists in Lake Victoria as Spring Break begins. He reunites with his old crush, Kelly (Jessica Szohr) before being chased off by her boyfriend. He meets Derrick Jones (Jerry O’Connell) and Danni (Kelly Brook), a pornographer and one of his actresses. Derrick convinces Jake to show him the hot spots on the beach for a pornographic film.

Meanwhile, Sheriff Julie Forester (Elisabeth Shue), Jake’s mom, searches for the missing Matthew Boyd at night with Deputy Fallon (Ving Rhames). They find his mutilated body and contemplate closing the beach down.

The next day Jake bribes his younger sister and brother, Laura (Brooklynn Proulx) and Zane (Sage Ryan), to stay home alone so that he can show Derrick around the beach with Danni. Despite promising Jake that they won’t leave the house, Laura and Zane go fishing on a small island. They forget to tie the boat down and are stranded in the middle of the lake.

Novak (Adam Scott) and his two partners, Sam (Ricardo Chavira) and Paula (Dina Meyer), are seismologists who are called in due to the earthquake. Julie takes them out on the lake where Paula and Sam scuba dive to the bottom, discovering an underwater lake in a dark cave. They find thousands of eggs before they are killed by piranhas. One of the fish flops on board Julie’s boat with Paula’s body. Novak and Julie take it to pet shop owner, Mr. Goodman (Christopher Lloyd), who tells them it is a prehistoric fish and urges them to evacuate the lake.

Jake goes to meet with Derrick but encounters Kelly first, who invites herself onto Derrick’s boat. Jake meets Crystal (Riley Steele), another of Derrick’s actresses, and cameraman Drew (Paul Scheer). They film an underwater love scene between Danni and Crystal before partying. Jake spots Laura and Zane on the island, and forces Derrick to rescue them, causing the boat’s propeller to get stuck in seaweed.

Julie, Novak, and Fallon try to evacuate the beach, but their warnings are ignored until the entire school of piranhas attack the tourists. Novak boards a jet-ski with a shotgun to help while Fallon ushers people to shore and Julie tries to get party goers into the police boat. A stage set up in the water collapses from the weight of all the guests and the wet T-shirt contest host (Eli Roth) is killed.

Meanwhile, Derrick manages to break free of the seaweed, but then crashes into some rocks, flooding the rooms below deck. Kelly is trapped in in the kitchen while Derrick, Crystal, and Drew are thrown from the boat. Crystal and Drew are devoured while Danni manages to get a partially eaten Derrick back on board. Jake, panicking that he can’t reach Kelly, calls his mother.

After saving many guests, Julie and Novak commandeer a boat and take it to Jake’s sinking boat. Fallon stays behind fighting off the piranhas with a shotgun in shallow water. Seizing the motor off a speedboat, he turns it on and shreds much of the swarm with it, sacrificing himself but giving more swimmers a chance to get out of the water.

Julie and Novak reach Jake and attach a rope to his boat. Julie agrees to come back for Kelly after the kids are safe. Danni goes over the rope first but the piranhas latch onto her hair and she is eaten. Laura, Zane, and Julie make it to safety but Jake breaks the rope. Using Derrick’s corpse as both distraction and bait, Jake ties the line to himself and goes underwater to save Kelly. He ties Kelly to him and lights a flare after releasing the gas in a propane tank. Novak drives at high speed just as the piranhas surround Kelly and Jake. They are dragged to safety and the propane tanks explode, destroying the boat and most of the piranhas.

Mr. Goodman calls Julie, telling her that the glands on the piranha they obtained were not mature, meaning that the piranhas they’ve been fighting are babies. Novak begins to ask where the big ones are in disbelief before a giant piranha jumps out of the water and drags him under.

Watch Piranha 3D Online Trailer