In the midst of an energy crisis, an ambitious petroleum executive organizes an expedition to a mysterious, fog-enshrouded island in the Pacific Ocean, believed to be rich in oil. The team, aboard the salvage ship Petrox Explorer, includes a pragmatic paleontologist and a beautiful, aspiring actress who was rescued at sea. As they make their way through the ominous fog surrounding the island, they are unaware of the extraordinary creatures they are about to encounter. The island's dense jungle not only conceals vast reserves of oil but is also the home to a variety of gigantic animals, a revelation that astonishes the expedition team.

Upon their arrival, the team encounters the island's indigenous people, who capture the actress and offer her as a sacrifice to Kong, a colossal ape who is revered as a god by the islanders. The ape becomes infatuated with her beauty and spares her life, leading to a complex relationship between the two. Meanwhile, the rest of the team devises a plan to rescue her and capture Kong, envisioning the immense fame and fortune that could come from exhibiting the giant ape to the world. Their actions set off a chain of events that lead to chaos and conflict both on the island and beyond, as the boundary between civilization and the unknown is tragically blurred.