Best movies like Attack of the Giant Leeches

"Genius" accidentally invents "goo" which causes living things to rapidly grow to an enormous size. Seeing an opportunity to get rich, some delinquent teenagers steal the "goo" and, as a result of a sophomoric dare, consume it themselves and become thirty feet tall. They then take over control of the town by kidnapping the sheriff's daughter and dancing suggestively.

A sheriff investigating the disappearance of a young girl from a small island discovers there's a larger mystery to solve among the island's secretive, neo-pagan community.

Dead bodies are being found in New York harbor. The police have no clues nor suspects until Nick and his colleague realize the killer is a giant octopus. Everybody, especially the police captain, refuses to believe Nick's story, and soon the harbor will be filled with boats for the 4th of July celebrations.

The Swamp Thing returns to battle the evil Dr. Arcane, who has a new science lab full of creatures transformed by genetic mutation, and chooses Heather Locklear as his new object of affection.

On the last working day of Sheriff Wayne, his small town is attacked by blood thirsty ravens that eat human flesh. Meanwhile his wife Cynthia visits a farm where a Mennonite family lives to say farewell to her friend Gretchen and discloses a dark secret about the origin of the fierce ravens.

Trapped on a remote island by a hurricane, a group discover a doctor has been experimenting on creating half sized humans. Unfortunately, his experiments have also created giant shrews, who when they have run out of small animals to eat, turn on the humans.

A team of environmentalists, including a reporter, her camera man, and an environmentalist's famous girlfriend charter a boat and with the captain, sail to a military island. They suspect the island is hosting to illegal activities. Upon arrival, however, they find no one. They finally reach a deserted house, where they find Dr. Susan Richardson, who tells them that everyone on the island is dead, including her father. Richardson's team were working on a compound that could make edible plants grow to super size, however the military intervened with plans of their own. They wanted to test the compound's effects on animals, and proceeded to feed it to several komodo dragons and cobras.

Altered Species is a 2001 horror film, about a scientist who has found a way to regenerate damaged tissue in the body. He has tried his experiment on rats, but the effects are disastrous. One of them grows to 50 times its normal size, and attempts to destroy the laboratory.

A backwoods game warden and a local doctor discover that giant leeches are responsible for disappearances and deaths in a local swamp, but the local police don't believe them.

A young woman gets raped by a mysterious man-creature, and years later her son begins a horrific transformation into a similar beast.

In Arborville, California, three high school students discover a strange, gelatinous substance that melts the flesh of any living creatures in its path and wreaks havoc across town.

Chaank Armaments is experimenting with the ultimate fighting machine which is part human - part machine. So far, the Hardman project has been unreliable and has killed a number of innocent people. The genius behind this project is Jack who lives in a world of models, toys and magazines. When he is fired by Cale for killing a few corporate officers, he unleashes the ultimate killing machine called the 'Warbeast' against Cale and those who would help her.

After a bank robbery, four criminals escape to Mexico, but a storm causes an accident which takes down the plane where several die in the crash. The criminals take it into their own hands to continue when one survivor is attacked and eaten by a crocodile. The criminals kill it, but from then on the mother Crocodile is on a killing spree with a goal to kill each survivor. But that is not the only worry, because they're trapped within it's world, and if it doesn't kill them, the criminals will.

A growth hormone experiment gets out of hand, when the the resulting giant man-eating rats escape, reaking havoc on the unsuspecting campus. Much blood-letting follows.

Jason Crockett is an aging, grumpy, physically disabled millionaire who invites his family to his island estate for his birthday celebration. Pickett Smith is a free-lance photographer who is doing a pollution layout for an ecology magazine. Jason Crockett hates nature, poisoning anything that crawls on his property. On the night of his birthday the frogs and other members of nature begin to pay Crockett back.

Several people disappear from and at the sea. Their bodies are found gnawed to the skeleton, even the marrow is missing. The scientists have no idea which animal could do such things. Dr. Turner begins to suspect that the company which builds a tunnel beneath the bay might have poisoned the environment and caused an octopus to mutate to giant dimensions...

When a young woman learns that she's pregnant, she leaves graduate school to set up a home with her boyfriend in the country. The fate of the happy new family takes a gruesome turn when animals and people end up brutally dead – all with a strange connection to their newborn. Could their new child be the responsible for the killings?

When a crop of doped-up athletes from the Lakecrest College swim team dive into the campus lake to blow off some steam, the bloodsucking leeches below the surface undergo a stunning transformation. After ingesting small amounts of the swimmers' steroid-laced blood, the slimy creatures grow to unusual sizes and set out to sink their teeth into an unsuspecting student population.

A fanatical animal rights activist releases giant pythons into the Everglades, believing the wild animals should be set free. When they start decimating the native animal population, an over-zealous park ranger feeds experimental steroids to wild alligators so they can fight back. The giant pythons and gargantuan alligators go on a killing spree, and it is now left up to the two feuding women to put aside their differences to put a stop to the creatures and the destruction.

Doctor Baines has been conducting genetic experiments on piranhas and has made them virtually unstoppable. Unfortunately, his assistants, Maggie and Paul, accidentally release the hybrids into the Lost River Lake threatening to destroy everyone in their path. Can they prevent the flesh-eating piranhas from escaping into the ocean and spawning?

Sleepy New Haven California is a small town with a big problem. A sixty foot slithering horror has arrived and shattered the town's tranquillity on it's path of death and destruction... Growing violent and more savage with each attack the gigantic creature soon becomes an unstoppable feeding machine raging beyond control of it's creator, leaving only the stripped bones of it's victims in it's wake.

Open on gorgeous swamplands of the Atchafalaya Basin in the summer. Lots of beautiful teens are at the beach the weekend before Gator Fest. That night an animal smuggling deal goes wrong and a large sea creature escapes into a swampy backwoods river. At the McDaniel's "Gator Shack" restaurant, a local, Jackson is drunk, and gets mangled to bits. The town sheriff blames the carnage on the McDaniel's "escaped" pack of gators and tries hauling them off to jail. Rachel McDaniel, head of the family, claims to have seen the fin of a shark! Rachel and her family, along with the help of a mysterious stranger, Charlie, take on the Swampshark and the law to clear their names, save Rachel's kid sister Krystal and prevent the unwitting folks at the upcoming Gator Fest from being torn to shreds by a beast the likes of which no one has ever seen!

Hick handymen Val McKee and Earl Bassett can barely eke out a living in the Nevada hamlet of Perfection, so they decide to leave town -- despite an admonition from a shapely seismology coed who's picking up odd readings on her equipment. Before long, Val and Earl discover what's responsible for those readings: 30-foot-long carnivorous worms with a proclivity for sucking their prey underground.

65 million years ago, the only 2 survivors of a spaceship from Somaris that crash-landed on Earth, must fend off dinosaurs to reach the escape vessel in time before an imminent asteroid strike threatens to destroy the planet.

A group of mutant gators attack the cajun people. Pouring blue chemicals in a Louisiana swamp causes the alligator population to morph into monstrous creatures including a clan of cajuns living in the bayou.

Children turned into zombies wreak havoc in a coroner's building with just a burned-out psychic, an experienced cop and two coroners to stop the madness.

Happy couple Jason and Alexandra lose their sail yacht in a storm and are grateful to get picked up by Captain Jim Bigelow's commercial carrier. Suspicious about the ship's doctor and realizing the ship is improbably empty and the radio not broken as the crew claims, Jason starts snooping around. Bodies on meat-hooks, genetic experimentation and giant spiders are what he finds.

An alien starship crashes in a swamp in a U.S. National Park. Some mosquitos begin to feed from the alien's corpses, causing them to grow to the size of a vulture. These mutant insects became very agressive, killing every human being they find. Will the few survivors fight successfully against this nightmare...?

When her father seemingly goes missing, divorcee Laura LeCrois is forced to return home after a 20-year hiatus. However, home is not the way Laura remembers it. Her father is in major debt with the bank, her ex-boyfriend is the town sheriff, and her ex-husband has quit his job as a world-renowned professor who is now suspiciously buying up swampland in the area. In an effort to save the swamp and to pass the time, Laura decides to work the dying family business giving boat tours of the Louisiana swamp. But on her first sunset tour, deep in the swamp, Laura and her passengers witness two Bayou swamp rats toss a squirming body into a gator pit, only the gators aren't the ones that feast on the flesh. Instead it's the most terrifying creature Laura has ever seen...(IMDB,com)

Eight of the world's most legendary monsters, along with their diabolical managers, compete in a wrestling tournament deathmatch to determine the most powerful champion of all time. Interviews, pre-fight breakdowns, trash talking, and monster origin segments round out this ultimate fight of the living dead.

A skier and his wife visit a friend's ski resort during a man beast's rampage, and must hide from the impending danger.

James Murphey is a rugged cryptozoologist, who thirty years earlier, during a trip to Loch Ness, Scotland, had a fatal encounter with the fabled "Nessie" creature that killed his father, and left James with deep facial scar. Twenty years later, James is hunting for Nessie, when his search leads him to the sleepy town of Pike Island, Ashburn, on Lake Superior. Hiring Josh Riley as his guide, James and Josh bond over their mutual scientific interests and deceased fathers, while James tries to convince Josh's mother, Sheriff Karen Riley, that the 60-foot plesiosaur is killing and breeding.

The Megalodon shark. A prehistoric killing machine 60 feet long, flashing 200 pounds of teeth and weighing over 20 tons. It's the deadliest predator the world has ever seen. The scientists say it's been extinct for more than 10,000 years. The scientists are wrong. In the darkness of the deep, an underwater research station has been viciously destroyed. Now a tough team of daring divers led by Spencer Northcutt [Antonio Sabato Jr. "Melrose Place"] is taking an experimental sub to war. It's killer instinct vs. sophisticated technology, deadly jaws vs. harpoon-tipped torpedoes, mega-shark vs. modern man is a thrilling extreme deep sea fight to the death.

A horrifying hybrid of genetic science and nature has taken over the Louisiana bayou, leaving terror in its wake! In the heat of the summer, what began as an day of boating and bikinis changes drastically when a school of genetically enhanced snakehead fish finds their way into Black Briar Swamp.

Kyle, a shy college student finds himself and three of his friends trapped in an old western ghost town by a pack of ferocious wolves and has to overcome his personal fears to confront the wolves and lead his friends to safety.