On a remote South Seas island, local prince Kimo is wrongfully accused of treason and sentenced to death by a vengeful witch doctor. Before he is executed, Kimo vows revenge against his persecutors. Stricken with a cursed dagger and buried in accordance with native traditions, the prince’s lifeless body is left to rest beneath the ground. Not long after, American scientists, led by the dedicated Dr. Arnold, arrive on the island to conduct research on a mysterious radioactive mineral that has been newly discovered.

Unbeknownst to the researchers, the island’s unique radiation revives Kimo’s vengeful spirit, causing his body to metamorphose into a fearsome tree-like creature known as Tabanga. Awakening with an insatiable thirst for revenge, the monstrosity begins terrorizing both the islanders responsible for Kimo’s unjust death and the unsuspecting Americans. As chaos and fear spread, Dr. Arnold and his team must find a way to understand and stop the rampaging beast before it destroys everything in its path.