Somewhere on a distant planet, X and Geed were defeated by a pair of black Ultramen who bore their likenesses in appearance. At the same time, an old enemy of Taro named Ultra Dark-Killer targeted both Zero and Grigio, forcing Taro to recruit the New Generation Heroes to stop the League of Darkness.

Mysterious aliens and evil monsters that shouldn’t exist are attacking! Zero, Ribut, Taiga, Z (Zett), 80, Max, Mebius, Great, Powered, Grigio, and many more Ultra Heroes fight together to solve this mysterious case, which could end up affecting the whole universe. However, this is only the beginning! A conspiracy is underway – and stories are intersecting. What is the aim of the golden giant working in the shadows?! While connecting to the TV series Ultraman Z as well, a new history of Ultraman begins!