Great Decisive Battle! The Super 8 Ultra Brothers

Great Decisive Battle! The Super 8 Ultra Brothers (Japanese: 大決戦！超ウルトラ８兄弟) is a 2008 Japanese tokusatsu film produced by Tsuburaya Productions. Directed by Takeshi Yagi with a screenplay by Keiichi Hasegawa, the film serves as a significant crossover entry in the long-running Ultraman franchise.

The film was released in Japan on September 13, 2008, and distributed by Shochiku. It features a cast including Hiroshi Nagano, Takeshi Tsuruno, Takeshi Yoshioka, and Shunji Igarashi, alongside veteran actors from the franchise's history such as Susumu Kurobe and Kohji Moritsugu. The film's theme song, "Light In Your Heart," was performed by the group V6.