- A cop chases two hippies suspected of a series of Manson family-like murders; unbeknownst to him, the real culprits are the living dead, brought to life with a hunger for human flesh by ultrasonic radiation being used for pest control.
- In the peaceful, lush, green countryside gruesome murders are committed by the dead who have been brought to life by ultra-sonic radiation. Two travelers from the city who meet accidentally are harassed and implicated by the cops for the murders.—Fella_shibby@yahoo.com
- A cop chases two young people visiting the English countryside, suspecting them of a local murder. Unbeknownst to him, the real culprits are the living dead, brought to life with a thirst for human flesh by radiation being used by area farmers as a pesticide alternative.—Jojo Mac
- Brought about by the use of a new, radiation emitting device intended to destroy insect's nervous systems, the dead are brought back to life due to the jump start the radiation provides to their nervous systems. After the murder of a woman's estranged husband, police suspect the woman, her sister and a relative stranger (who was only along because the sister had run into his motorcycle only hours prior) of involvement in the murder, and as the bodies begin to accumulate the police chief becomes more and more convinced of their involvement.—Patrick
- George (Ray Lovelock) leaves his antique shop in Manchester and goes to the countryside to spend time with friends, but at a gas station his motorcycle is accidentally damaged by fellow motorist Edna (Cristina Galbo). George commandeers Edna's car and demands that she take him to his destination. When they become lost, George leaves Edna alone in the car and asks for directions from a neighbor, a local farmer who is using a strange looking machine; he tells George it is a newly invented form of pest control, which creates a radiation that attacks the nervous systems of insects and causes them to cannibalize one another until the population is eliminated. The environmentally-conscious George is suspicious of the machine, but the men operating it insist it is perfectly safe and has no effect on human beings. Back at the car, a sinister waterlogged man (Fernando Hilbreck) attacks Edna, but when she returns with George and the farmer, the man is gone.
Meanwhile, Edna's sister Katie (Jeannine Mestre) lives nearby with her husband, Martin (Jose Lifante). Katie is a recovering drug addict who has secretly relapsed; when she sneaks out to their shed to do heroin, the weird man who attacked Edna is there and comes after her. The man murders Martin and chases Katie, but he is warded off by the arrival of George and Edna, who discover Martin's corpse. When the authorities arrive, the cynical inspector (Arthur Kennedy) is suspicious of George, Edna and especially Katie, who he claims murdered Martin due to her drug addiction. Katie suffers a breakdown and is hospitalized. When Edna and George go to the hospital, they discover the staff in a panic because several newborn infants have attacked staff members, bloodying them. The doctor has no explanation, but when George tells him about the machine he saw the farmer and his crew using, he asks George to take him there, where he questions them about it. The doctor theorizes that the machine, designed to attack the nervous systems of lower forms of life, may also affect babies.
Later, a local druggist hears Edna describe the man who attacked her and identifies him as Guthrie, a vagrant who recently drowned. Theorizing that the man may still be alive, they seek out his last known whereabouts, the local cemetery where he was being prepared for burial. When George and Edna go searching there, they find the place deserted, but while searching for the caretaker they are attacked in a workshop by Guthrie, who they now recognize is a zombie that has been reanimated by the farm machine. Their exit is blocked, but they are able to fend Guthrie off, so he reanimates two other corpses by putting some of his blood on their eyes. With three zombies now, the situation becomes more dire. George and Edna escape through a grate, but are chased back inside by the zombies, along with a police officer sent by the Inspector to check up on George and Edna. The zombies kill and eat the policeman, but George and Edna escape after they set the zombies on fire. George tells Edna to drive her car back to the cottage where he will meet her after taking the policeman's car to go destroy the radiation machine, but as she drives off, he realizes the keys are missing and he is forced to get there on foot. The machine operators tell George that they've increased the influence of the radiation up to a five mile range, which infuriates George even further. They flee after George violently disables the contraption, forcing him to set out again on foot. The Inspector arrives at the cemetery and discovers the carnage, blaming the entire thing on George and Edna and vows to apprehend them.
At the cottage, Edna discovers the remains of a policeman killed by Martin's now-roving corpse, and Martin attacks her as well, but she gets away and is rescued by George. They take the car to a local gas station, where George leaves Edna and returns to burn Martin's corpse before it can reanimate any more ghouls, but the police are waiting for him instead and arrest him. They inform him that Martin's corpse, now dormant due to George disabling the machine, has been taken to the hospital in Manchester, where George fears it could reanimate others.
When the machine is repaired by the operators, the corpses at the hospital come back to life and go on a violent rampage, murdering and cannibalizing several hospital employees. George escapes from the police station and races off to the gas station to reclaim Edna, but the proprietor informs him that Edna's been taken to the hospital as well. Now realizing Edna is in danger, George drives off to rescue her and Katie, who is also there after her own breakdown. Katie is attacked and transformed by the zombies, and she goes into Edna's room to murder her, too. The other zombies arrive and surround Edna, while George appears and sets them on fire. Pulling Edna from the room, he is horrified to realize she's dead and has been reanimated, too. Hurling her back into the burning room, she reaches out to him, seeming to recognize him as she burns. George is suddenly shot dead by the Inspector, who has arrived with police backup. With all the zombies burned, the Inspector is still able to deny George's wild story, but when he arrives back at his hotel, he is confronted by George's reanimated corpse, which strangles him to death.
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