The Third Age of Monsters has begun. Severely injured during a Kaiju attack, championship boxer Kotaro Higashi is transported to the Land of Light in Nebula M78. There, his life is merged with that of a new young Ultra Hero. Returning to Earth, Kotaro joins the Space Science Defense Force called ZAT ( Zariba of All Territory) to protect the Earth as the sixth Ultraman Brother... Ultraman Taro!