Newborn Ddol-i is traveling by plane with his parents when he gets caught in the Bermuda Triangle and falls into prehistoric times. In the accident, he is separated from his parents and lands in the middle of a primitive tribe. Chief Ddol-chi, who discovers Ddol-i, decides to raise him himself despite the tribe members' opposition. As he grows, Ddol-i accidentally kills the young of the white dinosaur Tyranno, and the villagers try to expel him to avoid the white dinosaur's wrath. However, that night, the white dinosaur attacks, and the village is almost annihilated. Chief Ddol-chi, believing Ddol-i is dead, becomes disabled while trying to avenge his family. Several years later, Ddol-i, who has grown into a fine young man, meets his biological father in a cave, who has been conducting experiments and research to return to his original world. Ddol-i learns that his mother was killed by Tyranno, but he denies being Chief Ddol-chi's son and rejects him. Meanwhile, Chief Ddol-chi, who has lived for revenge, learns that Ddol-i is alive and once again aims his vengeance at the white dinosaur Tyranno.