The film reduced Wells' tale to an "Ecology Strikes Back" scenario, common in science fiction movies at the time. The "food" mysteriously bubbles up from the ground on a remote island somewhere in British Columbia. Mr. and Mrs. Skinner (John McLiam and Ida Lupino) consider it a gift from God, and feed it to their chickens, which grow larger than humans as a result. Rats, wasps, and grub worms also consume the substance, and the island becomes infested with giant vermin. One night, a swarm of giant rats kill Mr. Skinner after his car breaks down in the forest.
The film opens with an alien ship that crashes into a U.S national park. The alien's dead arm comes out of the craft and a small mosquito starts feeding off the blood. While driving, two lovers Megan and Ray (Rachelle Loiselle and Tim Lovelace) accidentally hit the mutated giant mosquito. They get out of the vehicle to analyses it, unsure of its nature. They then go to a summer camp and rent a Bungalow. Meanwhile Hendricks (Ron Asheton) is sent off to spread mosquito killing gas everywhere and even on the campers. Three bank robbers, Earl, Junior and Rex are stopped in the forest and this is when Rex first meets his encounter with the giant mosquitoes. He runs for his life but is accidentally shot down by Junior. Megan, Ray, Earl, Junior, Hendricks and Parks a searcher for a radioactive meteorite are brought back together in a RV. They fight against the insects until the vehicle tips over and crashes. Everyone manages to get out, except for Junior who is attacked and brutally killed by the mosquitoes. The rest of the group are trapped inside a sewer and fight off the mosquitoes with fire. The morning comes and the group comes out exhausted and wounded. They walk through the forest, find and hide in an abandoned farm house. But the mosquitoes quickly find the crew and try to get them. Meanwhile, searching around the house, Parks and Hendricks find a room filled with mosquito larva. So they plan to blow up the house to kill all the mosquitoes. They install a bomb, while still fighting against the mutants. Hendricks tries to escape the house by an elevator but the contraption breaks and Hendricks falls to his death. Earl is also later killed, one second before the house explodes and only Parks, Ray and Megan manages to survive.
In the year 1973, the most recent underground nuclear test, set off near the Aleutians, sends shockwaves as far south as Monster Island, disturbing the monsters, causing Anguirus to fall into a fault opened up by the consequential earthquakes and Rodan to fly off, while Godzilla decides to stay put.
The films starts with Astrophysicist Ryoichi Shiraishi, his fiancee Hiroko, his sister Etsuko, and his friend Joji Atsumi witnessing a festival at a local village near Mount Fuji. Shiraishi then tells Atsumi that he has broken off his engagement with Hiroko but gives no reason other than an undisclosed obligation to remain in the village. A mysterious forest fire is then seen near them. Shiraishi rushes out to investigate and disappears during the confusion.
Continuing after the end of the previous film, Interpol agents, led by Inspector Kusaka, search for the wreck of Mechagodzilla at the bottom of the Okinawan Sea. Using the submarine, Akatsuki, they hope to gather information on the robot's builders, the alien simians. The Akatsuki is suddenly attacked by a giant aquatic dinosaur called Titanosaurus, and the crew vanishes.
The story picks up about a month after the dramatic finale of the previous film and follows the further adventures of filmmaker Carl Denham, now implicated in numerous lawsuits following the destruction wrought by Kong. Denham leaves New York with the captain of the Venture, Captain Englehorn, who is certain it is just a matter of time before he is similarly served. Their efforts to make money shipping cargo around the Orient are less than successful. In the Dutch port of Dakang, Denham is amused to see there's a "show" being presented, so he and Englehorn attend. It turns out to be a series of performing monkeys, capped by a song ("Runaway Blues") sung by a young woman named Hilda.
Garda Ciarán O'Shea (Richard Coyle), an alcoholic, initially resents his new partner, Garda Lisa Nolan (Ruth Bradley), a workaholic seeking to impress her superiors by volunteering for temporary duty in a remote Irish island. After discovering mutilated whale corpses, the quiet community slowly comes to realise that they're under attack by bloodsucking tentacled creatures of various sizes that came from a ball of green light that fell from the sky, dubbing them "Grabbers". When Paddy (Lalor Roddy), the town drunk, inexplicably survives an attack, the local marine ecologist, Dr. Smith (Russel Tovey), theorizes that his high blood alcohol content proved toxic to the Grabbers, who survive on blood and water. O'Shea contacts the mainland, but an oncoming storm prevents any escape or help. The group also realizes the rain will allow the remaining large male Grabber to move about the island freely. Seeking to keep calm in the town, Nolan and O'Shea organize a party at the local pub, intending to keep the island's residents safe but unaware of the danger. Initially hesitant to join in a celebration when no good reason can be offered, the people enthusiastically agree when Brian Maher (David Pearse), the pub owner, offers free drinks. O'Shea volunteers to stay sober so that he can coordinate the towns defenses, and everyone else becomes drunk.
A mysterious, man-sized monster kills a fisherman at sea. Two government agents later find the body on the beach. One agent, Ted Baxter (Kent Taylor), tries to get a sample of a radioactive rock in the sea, but the same monster attacks him. Ted escapes and returns to the beach. On a later trip with the other agent, William Grant (Rodney Bell), the monster nearly kills Ted, but Grant shoots it with a spear gun. Ted discovers that Dr. King (Michael Whalen), a marine biologist, created the monster and the radioactive rock. Ted tells Dr. King the monster is killing people and must be stopped. Dr. King destroys his lab and goes to kill his creation using dynamite. Shortly before a timed detonation, the monster grabs him. Ted arrives just in time to witness the explosion, which destroys the rock, the monster, and Dr.
Off the coast of Alaska, oceanographer Emma MacNeil (Deborah Gibson) is studying the migration patterns of whales aboard an experimental submarine she took without permission from her employer. Meanwhile, a military helicopter drops experimental sonar transmitters into the water, causing a pod of whales to go out of control and start ramming a nearby glacier. In the chaos, the helicopter crashes into the glacier, and the combined damage breaks the glacier open, thawing two hibernating, prehistoric creatures. MacNeil narrowly avoids destruction as, unknown to her, a giant shark and octopus are freed. Some time later, a drilling platform off the coast of Japan is attacked by the octopus, which has tentacles large enough to wrap around the entire structure. After returning to Point Dume, California, MacNeil investigates the corpse of a beached whale covered with many bloody wounds. Her employer Dick Richie (Mark Hengst) believes them to be from a tanker propeller, but MacNeil insists they appear to be from a creature. Later, she extracts what appears to be a shark’s tooth from one of the wounds. Elsewhere, the huge shark leaps tens of thousands of feet into the air from the ocean and attacks a commercial aircraft, forcing it to crash into the water.
Off the coast of a small Sicilian fishing village, two fishermen watch in amazement as a spaceship pierces the skies and crashes into the sea. The men, Mondello (Don Orlando) and Verrico (George Khoury), row out to the site and pull two space travelers from the capsized craft before it shudders and sinks into the sea. Meanwhile, in Washington, D.C., General A. D. McIntosh (Thomas Browne Henry) discovers that the government's missing spacecraft, piloted by Col. Bob Calder (William Hopper), has been located off the coast of Italy. As McIntosh flies to Italy, Pepe (Bart Braverman), a little boy who lives in the fishing village of Gerra, finds a metal capsule that has washed up on the beach. Upon opening the capsule, he finds a jelly-like glob inside and sells it to Dr. Leonardo (Frank Puglia), a visiting zoologist who is studying sea creatures. Meanwhile, Leonardo's medical-student granddaughter Marisa (Joan Taylor) is summoned to town to take care of the injured Calder and his companion, Dr. Sharman. When Calder regains consciousness, he finds Sharman in the last throes of the fatal disease that decimated his crew.
A 36-foot-gorilla escapes from an oil tanker off the coast of Korea. After battling with a giant Great White Shark, the ape reaches land and destroys several buildings and attacking a giant Python (the snake's origins are never revealed) before finding and kidnapping an American actress named Marilyn (Joanna Kerns). The military eventually corners and kills the ape, prompting one observer to comment, "He was just too big for a small world like ours!"
Figée dans les glaces de l'Antarctique depuis la préhistoire, une mante religieuse géante est libérée à la suite de la brisure d'un iceberg. Le monstre attaque alors New York, puis Washington. L'armée va devoir stopper l'insecte.
As an amorphous alien lifeform annihilated a television satellite above Japan, a similar creature on Earth suddenly thwarted the efforts of a local branch of the International Diamond Robbery Ring. The diamonds they sought vanished, and similar unexplained events continued to occur across the globe. The gangsters thought they were in luck however, for they caught word of a shipment of raw diamonds in Yokohama. The professional thieves took advantage of this ripe opportunity and attempted a heist on an armored car; unfortunately for them, they were fooled and escaped with nothing but candy...
A series of volcanoes erupt in Japan. The eruption at Mt. Futago (in Shizuoka Prefecture) attracts Gamera, whose arrival is witnessed by a young boy named Eiichi. Gamera then climbs up and into the volcano. A research team is dispatched to the volcano to find Gamera and study the effects of the eruption. Meanwhile, Chuo Expressway Corporation is building a roadway nearby, but local villagers refuse to leave.
The spaceship AAB Gamma is dispatched from Japan to travel to Mars to investigate reports of UFOs in the area. When the Gamma nears the red planet, it comes across a mysterious alien vessel that sprays the ship with spores. Samples are taken back to earth where one of them begins to develop.