Uncouth, loud-mouth junkyard tycoon Harry Brock descends upon Washington D.C. to buy himself a congressman or two, bringing with him his mistress, ex-showgirl Billie Dawn.

Men capture the creature from the Black Lagoon and make him an aquarium attraction, from which he escapes.

In the border town of San Pablo, preparing for an annual ‘Mexican Fiesta,’ the tough, mysterious and laconic Gagin arrives. His mission is to find the equally mysterious Frank Hugo, evidently for revenge, or is it for blackmail? FBI agent Retz is also after the elusive Hugo. Everyone in town is enigmatic, especially Pila, a mystical young woman who follows Gagin around after premonitions of his death. The story includes a classic femme fatale and an antique carousel with a pink horse.

Test space rockets exploding at liftoff and increased reporting of UFO sightings culminate in a direct attempt by alien survivors of a dead, extra-galactic civilization to invade Earth from impervious flying saucers, using ray-weapons of mass destruction.