Super GUTS and Ultraman Dyna succeed in destroying Gran-Sphere, but at the cost of losing Dyna/Shin in the resulting black hole created by its destruction. Shin meets his long lost father one last time as they travel together to parts unknown.
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According to writer Keiichi Hasegawa, this episode explores the idea that if Ultraman were human, he would represent human progress. In the finale, Dyna ignores Kohda's warning and is swallowed by a black hole, showing his role as a "human" Ultraman.[2]
Hasegawa initially considered a "heading toward the light" theme for the ending but felt it didn't fit. He and director Kazuya Konaka decided early that the story would end with Asuka facing a "new departure." In Ultraman Tiga, light symbolizes humanity's inner spirit, while in Ultraman Dyna it represents the future humanity should reach, shown by the "Ultra Star" from space.
Hasegawa said Ultraman is an idea for humanity, a goal to reach. The space Asuka and his father enter shows the future humans could achieve. No clear buildings are shown; it’s like a cosmic gateway blending Asuka’s mind with Ryo's imagination.[3]
When Asuka realizes he is Dyna and refuses to give up at the last moment, he enters the next dimension, becoming a symbol of the future humanity should strive for. His hope drives him forward, and with his father, he reaches the light of Ultraman.[4]
The team built a Gran-Sphere model but showed only a few shots, using miniatures for the black hole collapse.
Hasegawa said the Sphere represents an extreme stage of human civilization, focused only on survival. Despite this, humanity remains central. Kazuma's bond with Asuka reflects true human nature, and by the end, Asuka becomes a symbol of light, showing their spiritual connection.
Due to time limits, some scenes were cut from the TV version but later included in the special DVD director's cut. One such scene shows Asuka revealing his identity as Dyna to Super GUTS and admitting his fear: "If everyone knew I was Dyna... would they be scared?" Ryo replies, "Most might, but we're different."[5] As they return to their seats, Kariya says, "So, he's Dyna... it feels natural." Nakajima adds, "I feel the same... I just accepted it." Mai says, "It's like we've known all along."
According to Joe Onodera, before the final battle, Nakajima recalls a scene with his late father, written especially for him by Hasegawa. Nakajima's original story arc had been cut, so Hasegawa created this scene as a gesture of support. During filming in January 1998, after Onodera's father, Shotaro Ishinomori, passed away, Onodera brought his own emotions to the performance.[6]
The final scene was shot on July 21, 1998. When the six Super GUTS members vow to follow Asuka's path while looking at the Ultra Star, Takeshi Tsuruno quietly watched nearby.
After the series ended, some suggested bringing Asuka back in a different ending. But many felt the finale should stand as is. Tsuruno agreed, saying, "Asuka should want to move forward," so the idea was dropped.