18 year old Jason and his best friend Tann journey to the mysterious Kong Island hidden in the heart of the Bermuda Triangle. With them is their college Professor, Dr. De La Porta. After a close encounter with dinosaurs, Jason is reunited with his grandmother, Dr. Jenkins, and Kong. With them is the beautiful Jungle Girl, Lua. Dr. Jenkins has resurrected Kong via DNA splicing and the Cyber-Link, a communication and data link to the Web. With the Cyber-link a person can also ""merge"" with other animals. De la Porta threatens Dr. Jenkins in an attempt to steal her research and discover the location of the magical Primal Stones. He uses the Cyber-Link to merge with a sabertooth tiger becoming the monstrous Badkat. Jason merges with Kong and drives De La Porta away after an epic battle.

On Kong Island, the evil Professor Ramone De La Porta forces Dr. Jenkins to take him to the location of the powerful, mystic Primal Stones. Jason, Tann, and Lua frantically search the exotic Island for the kidnapped scientist. They find Dr. Jenkins and De La Porta in the ruins of an ancient temple. De la Porta merges with a giant prehistoric bear, becoming Slothbear, and attacks them. Jason merges with Kong and defeats him

The theft of the Primal Stones from Kong Island threatens to awaken the ancient demon Chiros. Lua journeys alone to Chiros' ruined temple in an attempt to imprison him. She is captured and brainwashed by Harpy, one of Chiros' servants. They journey to the Island's volcano and set the demon free. Jason, Kong, and Tann arrive and Chiros awakens the monster Ominous to stop them. Jason merges with Kong and confronts him. In the fight Kong's anger transforms him into the gigantic Mega-Kong. He easily defeats Ominous forcing Chiros to retreat.

Harpy takes Dr. Jenkins and Chon-Dar prisoner in an effort to find the Primal Stones. Jason, Tann, and Lua attempt to rescue them, but Harpy gasses Kong with giant spider venom knocking him unconscious. Lua merges with Kong's mind to try to bring him out of his coma. She is forced to grapple with Kong's inner demons. Tann uses rockets to drive Harpy and her apbats away. Chiros sends the giant monster Ominous against our heroes, forcing Jason to merge with a T-Rex. Jason is defeated, but Kong awakens and saves him, driving Ominous away and freeing Dr. Jenkins, and Chon-Dar.