"Tourist Attraction" is an episode of the original The Outer Limits television show. It first aired on 23 December 1963, during the first season.

Dominating millionaire John Dexter drives a group of explorers and scientists pursuing an ancient lake monster that is reputed to live in the waters of a South American dictatorship. Using underwater detection equipment aboard Dexter's yacht, the creature is spotted swimming along the lakebed. Following several attempts, the creature is eventually captured and taken to the local university for study.

However, after the creature is immobilized and stored inside a freezer to aid in its preservation while out of water, Dexter plans to transport it to the United States to place it on display, and to enhance his reputation; but, San Blas' absolute ruler, Juan Mercurio, plans to use it to attract tourists to his country's faltering World's Fair, claiming the animal as a national treasure. During its captivity, the creature comes to life due to an inept guard's negligence, and emits ultrasonic waves, causing the freezer door to implode. It is recaptured before it can fully escape its confines, with an armed guard from Mercurio's palace ordered to stand watch. Dexter overpowers him, and arranges for the creature's transport on his private plane back to the States.

While his assistants prepare the monster for its trip, they are shocked to see several more of the creatures emerging from the lake. A marine biologist, previously employed by Dexter, urges them to turn the creature loose. Reluctantly, they comply, watching as it joins its comrades. Dexter, shooting at the creatures in an effort to stop them, is abruptly halted by a piercing, ultrasonic pulse. The creatures begin to crawl back into the lake, where they disappear under the water. With the combined energy of their earth-shattering sound waves, the creatures amass and then topple the dam created by Mercurio during his reign of power, killing him, and flooding San Blas, destroying all that he had built.

"In Man's dark and troubled history, there are vestiges of strange gods. This stone statue was, once, such a god a thousand years gone by in the central mountains of Pan America. Today, new gods have emerged – the god of power, the god of money. The Republic of San Blas lies west of the Orinoco Basin, slightly north of the Equator. Its principle exports are coffee, copra, mahogany, maize and saffron. In a hundred odd years, the reigns of government have changed many times; in blood, and fire, and death. The last of these revolutionaries was led by Juan Mercurio – the most absolute and powerful ruler of them all. Only the Indians who live close to the old gods in the volcanic uplands are unimpressed. They have seen the coming of the Conquistadors, with the power of their guns and flashing flags...the Revolutionaries, with the power of their zeal and their willingness to die...the Americans, with the power of their money, and bulldozers; with their summer houseboats in the crater lake of Ari Pana; with their gadgets, and machines, and devices..."

...
Wikipedia