When a mysterious mass disappearance strikes humanity, Rena and Shinjirou vanish, prompting journalist Kotaro Higashi to delve into the enigmatic 'disappearance incident.' Dark Star, an alien terrorist group, claims responsibility and delivers an ultimatum to Earth: surrender half the planet or half its population will perish. Meanwhile, Rena and Shinjirou find themselves aboard the Dark Star ship. As Koutarou uncovers dangerous truths, he becomes entangled in the conflict between Dark Star and the SSSP, facing near-death experiences. In the ultimate showdown, our heroes confront the colossal mecha, the Golden Fortress, wreaking havoc on the city. With ULTRAMAN, SEVEN, TARO, ZOFFY, JACK, and ACE uniting, the six ULTRAMAN champions stand together for the final battle.