The Ultra Brothers is the collective name of the legendary Ultras that have protected the peace of planet Earth. They are all members of the Inter Galactic Defense Force and are all unique in terms of battle skills. They are among the most skilled, powerful, and spirited of the Ultra Warriors. The group currently consists of 11 members who consider each other as brothers in arms, though the group appears in various arrangements depending on the number of members present, the most common of which being the Six Ultra Brothers, consisting of Ultraman to Ultraman Taro.

After the people of the world that came be known as the Land of Light, found themselves with the power of Ultra, their deep rooted sense of justice dictated that they should use their powers for good and to help bring peace to the universe, thus the Inter Galactic Defense Force was born. Eventually, it came to be headed by a powerful Ultra who earned the title, Father of Ultra, the one who defeated Alien Empera in personal combat. The Ultra Brothers consisted of several Ultras who had visited and protected the Earth for an extended period, save Captain Zoffy who only visited on several occasions for short visits.