In a small desert town, wealthy heiress Nancy Archer becomes the subject of scandal due to her tumultuous marriage with her philandering husband, Harry. One fateful night, Nancy encounters a mysterious object on the road that turns out to be an alien spacecraft. After a frightening confrontation with a giant alien, she is left severely distressed and attempts to warn the locals. However, her claims are dismissed by both the authorities and her husband, who is plotting to run away with his mistress, Honey Parker. The situation escalates when Nancy is discovered unconscious and is taken to the hospital, where doctors are baffled by her condition and the strange marks on her neck. Harry hopes for Nancy's demise, which would leave him free to seize her fortune.

As Nancy recovers, she shows signs of abnormal growth, and soon her size reaches monstrous proportions due to exposure to radiation from the alien. Her newfound height and strength become both a curse and a power amidst her personal turmoil. Ignored and embittered by betrayal, she breaks free from medical confinement and seeks vengeance against those who wronged her. Her towering presence wreaks havoc on the town, inciting panic among the residents. Tensions rise as law enforcement and scientists race against time to stop the impending chaos brought on by Nancy’s transformation. With her motivations driven by betrayal and a quest for justice, the town grapples with the challenges of combatting a giant force amidst strained relationships and hidden agendas.