In the depths of the jungle, a group of scientists undertakes a bold expedition to capture the legendary creature that has instilled panic in the waters of the region. This half-human, half-fish species has fascinated and terrified all who have heard of it. After several failed attempts and confrontations with the beast, they finally succeed in capturing it and transporting it to a laboratory to study and understand its nature.
However, the creature's arrival in civilization brings a series of unexpected complications. As the scientists conduct experiments, they discover that it is not only a fascinating being but also possesses its own intelligence and will. While one of them becomes obsessed with the idea of turning the creature into a “human” by bringing it to water, tensions within the group escalate. Ethical and moral dilemmas intensify when the creature begins to show signs of distress and desperation.
Just when things seem to be under control, the situation turns dangerous. The creature escapes, unleashing chaos and putting the loyalty and morality of the protagonists to the test. The struggle between the wild and the civilized becomes inevitable, leading them to question whether they have truly made a scientific advancement or if they have released something that should never have been confined. As night falls, the tension escalates, and the quest to regain control could turn into a real disaster.