Ultraman Ginga Strium is the powered up version of Ultraman Ginga, accessed by the fusing with Ultraman Taro via the Strium Brace. In this form he can use the special moves of the Six Ultra Brothers – Ultraman, Zoffy, Ultraseven, Ultraman Jack, Ultraman Ace, and Ultraman Taro. He also bears Protector armor on his shoulder blades, shoulders, and under his crystals, which resembles Taro's armor, sports a Beam Lamp like Seven and Taro, and his markings have changed to more resemble theirs. Whenever Ginga Strium used their techniques, he spontaneously emitted similar grunts to them.
Ginga lost this form after Taro left at the end of Ginga S, but he has seemingly permanently regained it after Taro granted Ginga a portion of his energy in Ultra Galaxy Fight: New Generation Heroes.