As Kong is escorted across the ocean, Godzilla ambushes him, leading to a brutal mid-sea battle where Godzilla overpowers Kong and nearly drowns him. To avoid further conflict, the team halts their mission temporarily, allowing Kong to recover. Meanwhile, Apex Cybernetics, a powerful organization, secretly develops Mechagodzilla, a cybernetic monster designed to surpass Godzilla.

Kong eventually leads the team into Hollow Earth, discovering an ancient throne room belonging to his species. However, upon activating the power source, Apex Cybernetics hijacks the energy, awakening Mechagodzilla, which soon goes rogue. In Hong Kong, Godzilla and Kong clash once more in a stunning battle, with Godzilla ultimately proving his dominance. But when Mechagodzilla emerges, the two titans join forces in an epic showdown, with Kong delivering the final blow.

With the threat eliminated, Godzilla retreats to the ocean, maintaining his status as Earth’s protector, while Kong settles in Hollow Earth, embracing his true home. The balance of nature is restored, but the titans’ rivalry remains unresolved, setting the stage for future conflicts.