Santa (Isamu Yamaguchi) and his friend Koichi (Nagamasa Yamada) are jobless vagabonds. They make their living by picking up coins on streets. Santa has a girlfriend named Omitsu (Yasuko Koizumi), but her father Seizo (Kotaro Sekiguchi) does not like having his daughter date a penniless man. He breaks the lovers up and tries to marry his daughter off to a rich man. Desperate, Santa seeks employment and wanders the streets. He can’t find a job at all but has an inspiration. RKO’s King Kong has been released and is a big hit in Tokyo. He decides to capitalize on its success by dressing up as an ape and playing King Kong in a vaudeville theater! He approaches one theater owner to tell him of the idea and the owner is pleased with Santa’s plan, thus giving him the job. Santa’s King Kong show becomes an instant success, with Santa interacting amongst props on the theater stage in his gorilla suit (small buildings, toy airplanes, a doll etc.). One day while performing on stage, Santa sees that Omitsu and her new rich boyfriend are in the audience. Blinded with rage, Santa jumps down from the stage and runs after them - with his gorilla suit on! Santa creates chaos in the town, as firemen and hunters chase him thinking him an escaped gorilla that is running wild in the streets. Eventually Santa confronts the rich boyfriend and knocks him unconscious. He puts the gorilla suit on him and leaves him lying out cold in the street. Just then Koichi comes and tells Santa that the theater owner will give him a lot of money for his performances. Now that he has wealth, Santa gets married to Omitsu.
The film opens with a brief scene serving as its introduction. A man is being caressed by feminine hands. The next shot includes the face of the woman, Tarantella (Tandra Quinn). A brief kiss between her and the man, ends with his lifeless body falling down. A disembodied voice asks the audience "Have you ever been kissed by a girl like this?" The narrative properly begins in a desert. A narrator (Lyle Talbot) mocks the overblown ego of humanity, a race of puny bipeds which claims to own planet Earth and every living thing on it. Yet, they are outnumbered by the insects, and the Hexapods are likely to survive longer that the humans. The narrator then claims that when men or women venture off "the well beaten path of civilization" and deal with the unknown, the price of their survival is the loss of their sanity.
Four astronauts in 1960 travel to a planet called Nova that has just entered Earth's solar system. The crew begins studying the planet to see if it's suitable for a possible Earth colony. After first discovering normal Earth animals such as a kinkajou and an alligator, they soon encounter and battle giant insects, an enormous snake, prehistoric mammals, dinosaurs, and - on an island - the titular character, King Dinosaur, a putative Tyrannosaurus Rex. Eventually, the scientists blow up the island with an atomic bomb, killing all of its inhabitants.
The film opens with newspaper photojournalist Audrey Aimes (Castle) accidentally stumbling upon a small town in Illinois which has been inexplicably destroyed. All 150 people in the town are missing, and the evidence indicates they are dead. Incredibly, the local fields are also barren, as if a swarm of locusts had eaten all the crops. Aimes suspects that the military is covering something up, and travels to a nearby United States Department of Agriculture experimental farm to learn what creature might have caused the agricultural destruction. She meets Dr. Ed Wainwright (Graves), who is experimenting with radiation as a means of growing gigantic fruits and vegetables to end world hunger. Dr. Wainwright reports that there have been a number of mysterious incidents nearby, and that locusts have eaten all the radioactive wheat stored in a nearby grain silo.
In preparation for sending a manned rocket into space, American scientists Dr. Quent Brady and Dan Morgan are put in charge of a program that sends various animals and insects into space to test their survival rates. After one of their rockets carrying wasps malfunctions and goes off course, a computer calculates that the rocket is likely to land somewhere off the coast of Africa. Some time later, in a remote part of Africa, Dr. Lorentz and his daughter Lorna perform an autopsy on a native and determine that he died of paralysis of the nerve centers caused by an injection of a massive amount of venom. Arobi, Lorentz' African assistant, then informs him that a monster is believed to be terrorizing people and animals in an area known as Green Hell.
Jack Flynn is driving down a highway at night, looking at a bracelet he has bought his daughter for her birthday. Suddenly he hits something and his vehicle crashes. The next morning, his teenage daughter Carol, is concerned her "bad-dog" father didn't come home last night. She convinces her boyfriend Mike to assist in a search for her father. They find his crashed truck and the bracelet, but not his body. Thinking he crawled into a nearby cave, they investigate. In the cave they fall onto the gigantic orb web of an enormous spider, a Mexican redleg tarantula, which emerges from behind some rocks to get them. They manage to escape and make it back to town.
On a Swiss mountain, one of three student climbers is killed, his head ripped from his body. Two sisters, a London mind-reading act, are traveling by train to Geneva when one of them, Anne Pilgrim (Janet Munro), faints as they pass the same mountain. Upon waking, she knows that there is something very wrong, so she decides they should get off at the very next stop, Trollenberg.
A rare species of butterfly native to Siberia is found in a mysterious valley in Japan, a pair of entomologists go to investigate. In response, an expedition is dispatched to their habitat, located along the Kitakami River, to discover why the insects might be living in Japan. Two members of the scientific community helm the expedition, but are mysteriously crushed by something that the police can only describe as "powerful." The nearby villagers of the Kitakami River insist that the deaths were a result of the wrath of their mountain god Baradagi-Sanjin.
The movie opens with a young couple parked in a bleak, rural locale overlooking a ravine. A giant gila monster attacks the car, sending it into the ravine and killing the couple. Later, some friends of the couple decide to assist the local sheriff (Fred Graham) in his search for the missing teens. Chase Winstead (Sullivan), a young mechanic and hot rod racer, locates the crashed car in the ravine and finds evidence of the giant lizard. However, it is only when the hungry reptile attacks a train (a model train set substituted as a low-budget effect) that the authorities realize they are dealing with a (roughly) 70-foot poisonous lizard. By this time, emboldened by its attacks and hungry for prey, the creature attacks the town. It makes straight for the local dance hall where all the teenagers had gathered for a sock hop. However, Chase packs his prized hot rod with nitroglycerin and rigs it to speed straight into the monster, terminating the lizard in a fiery explosion and heroically saving the town.
Captain Joe Ryan is salvaging for treasure off the coast of Ireland, when a volcano erupts, nearly sinking his ship. Ryan and his first officer, Sam Slade, take the ship to Nara Island for repairs. As they enter harbour, they discover the floating carcasses of marine animals, the first hint that something dangerous was awoken by the volcano eruption.
Triffids are tall plants capable of aggressive and seemingly intelligent behaviour. They are able to move about by "walking" on their roots, appear to communicate with each other, and possess a deadly whip-like poisonous sting that enables them to kill their victims and feed on their rotting carcasses. Their appearance is vaguely similar to gigantic asparagus shoots topped with a flower-like 'head' that somewhat resemble a Vanda Miss Joaquim orchid and houses their deadly stinger.
Daigoro is a monster who was orphaned after the military used intercontinental missiles to kill his mother while she tried to protect him. Only one man stood against that decision. He pitied the infant, and took it as his own and raised him in Japan. But Daigoro grew too large and too expensive to feed. The man made Daigoro an icon for a business. Elsewhere Goliath, a monster who had been trapped in an asteroid for a long time, went to Earth and battled Daigoro. Goliath eventually defeated Daigoro by striking him with lightning from his horn. Goliath then left to pillage the world, leaving Daigoro to die. Daigoro recovered and practiced daily for his next battle against Goliath. After an intense fight, Daigoro breathed his fire ray and managed to defeat Goliath. The humans then grabbed Goliath while he was still weak and strapped him to a rocket and launched him into space.
A party from Hong Kong headed up by Johnny (Danny Lee) are exploring the Indian side of the Himalayan mountains and discover the eponymous Peking Man, a gigantic ape-like creature, along with a beautiful blond wild woman named Samantha (Evelyne Kraft) whose parents had been killed in a plane crash. Samantha was raised by Utam (the Peking Man) with nothing to wear but an animal-skin bikini. Like Tarzan, she has learned both to swing through the trees on vines and to communicate with and command the jungle animals, with the exception of a venomous snake who bites her on the inner thigh requiring the hero Johnny to suck out the poison while Samantha's leopard friend fights the snake. Shortly thereafter, they fall in love.
Two romantic couples, consisting of four teenagers, decide to spend a weekend together located in a remote cabin found in the woods. An unseen force stalks and watches the group without their knowledge. Ellen (Ellen Sandweiss) and her boyfriend Bruce (Bruce Campbell) enter the woods to have a picnic lunch. The other couple, Scotty (Scott Spiegel) and Shelly (Mary Valenti), remain at the cabin playing Monopoly to pass time. During their lunch, Bruce announces to Ellen that they're camping on an Indian burial ground. Ellen is concerned, but Bruce assures her that they will be fine as long as they don't disturb the graves of the dead. Bruce then explores the area and discovers an ancient dagger belonging to the Indians. Ignoring his own advice, he takes the dagger with him.
The Aztec god Quetzalcoatl, a winged, dragon-like, female lizard, decides to take up residence in the art-deco spire of the Chrysler Building, taking frequent jaunts in the midday sun to devour various hapless New Yorkers. The resulting bloody mess confounds detectives Dr. Shepard (David Carradine) and Sgt. Powell (Richard Roundtree), who are already occupied with a case involving a series of bizarre ritual murders linked to a secret Aztec cult. Meanwhile, Jimmy Quinn (Michael Moriarty), a cheap, paranoid crook who wishes to be a jazz pianist, takes part in a botched diamond heist that leads him to the creature's lair atop the building. This causes Quinn's attempts to settle down and turn over a new leaf from crime to be in vain as he decides to extort from the city an enormous amount of money in exchange for directions to the creature's nest, which houses a colossal egg.