The Science Patrol is summoned to an island where a research team has been reported as missing. The rescue effort is hindered when it is revealed that the island is crawling with monsters.
An alien arrives on Earth claiming to be the brother of humanity. While he claims that the Science Patrol does not have Earth's best interest in mind, Ultraman begins attacking Earth.
An alien comes to Earth seeking to take control of it. But the only way he can get it is if he has permission from a boy. When the boy refuses, the alien decides to attack.