On a secluded Florida island estate, Ward Costello stars as Dr. Robert Hedges, a scientist working alongside his assistant, Victor, played by Fred Herrick. Together, they are pushing the boundaries of science by creating a machine capable of transporting objects through time. Their experiments involve sending a small statue from the future, which they later discover hails from the year 5200 A.D. This discovery sparks a series of complex events that blur the lines between science, morality, and the unknown.
Initially, the researchers are cautious due to the enormous energy required for their experiments. To further validate their findings, Howard Erling, played by Frederic Downs, halts the project temporarily and sends the statue to renowned archeologist Dr. Robert Hedges for analysis. Hedges quickly finds that the statue is radioactive, raising serious questions about its origin and the implications of their work. When he attempts to contact Howard for clarification, he finds himself flying to the island at the archaeologist’s invitation.
Once on the island, Hedges is pursued from the airport by Claire Joyce Holden, Howard’s daughter, and Victor’s fiancée. After a tense chase, Claire confesses she sent the statue herself, eager to speed up the verification process of her father's groundbreaking but risky experiments. She and Hedges then journey by motorboat to the estate, where Claire reveals that their boat's engine faltered because the lab’s energy drain is affecting the equipment, hinting at just how powerful and unstable the machine truly is.
Dr. Howard Erling welcomes Hedges kindly, showing confidence in their work, though Victor appears resentful—suspecting that Hedges might disprove their findings. That night, chaos unfolds when Victor secretly leaves and is later seen outside the guest room with two metal suitcases, which he discreetly tosses into a pond. The following morning, Hedges joins Claire in the pond for a swim and uncovers one of these suitcases, discovering the dead body of a small animal inside, hinting at strange and possibly dangerous consequences of their experiments.
Meanwhile, Howard displays their breakthrough — the ability to send objects forward and retrieve them, illustrating this with a small vial sent through the machine that returns intact. Hedges suggests trying something unusual, and Hedges himself drops in a fraternity key, which later reappears along with a mysterious coin from the future engraved with the words "save us" in Greek. The experiments take an even darker turn when Victor sneaks back to the lab at night and experiments with higher power settings, resulting in the apparition of a human form materializing before dissolving back into the future. Victor sustains a severe arm injury, which Emily, a doctor, later examines at the hospital, but Victor flees the hospital and later reappears drunk on the island.
Undeterred, Victor resumes dangerous experiments at the high power levels, breaking into the lab and risking everything. Their fears escalate when Howard, Hedges, and Claire discover Victor at a bar, with sudden malfunction in the bar’s television signaling that Victor has successfully activated the machine from afar. Racing back to the island, they find that Victor has succeeded in bringing a humanoid from the future—who then knocks him out and explores the island, even killing the servant Angelo in the process.
Hedges manages to retrieve one of the metal suitcases, containing the corpse of a strange four-eyed cat, while Howard and Bob confront the chaos unfolding around them. They discover Angelo’s body, and Victor, under the influence of the future visitor, recounts the horrifying events. The visitor, a time traveler, then attempts to manipulate and control the situation further by killing a nurse and creating a faceless replica to gain entry into the house, where it hypnotizes Victor into revealing her sinister plan.
As Claire intervenes, she exposes the alien visitor’s true grotesque appearance by tearing off her mask beneath the disguise, revealing a radiation-scarred face. The horror deepens when Howard, Bob, and Claire confront the realization that this future creature's goal is to bring Victor into the future to breed a new race of radiation-resistant human beings. The creature’s true intentions are revealed in a tense showdown where it and Victor are electrocuted and killed during their attempt to operate the machine at full power.
In the aftermath, Howard, Hedges, and Claire mourn the loss of their colleagues and the dangerous breach into the unknown. They are left contemplating whether someone should venture into the future to undo the catastrophe, but Howard ultimately encourages them to focus on preventing such a dark future from materializing in the present, emphasizing the importance of controlling technological threats before they spiral out of control.
This story explores themes of scientific hubris, the peril of unchecked technological experimentation, and the unforeseen consequences that come with peering into the depths of time, all woven into a tense and thought-provoking narrative of curiosity and caution.
