In Diga Theater Edition: Final Holy War, the famous Trio of Dark Giants appears. Among them, Camilla is the first female dark giant in the history of the Ultraman series. Compared to the Dark Trio 30 million years ago and 30 million years later, their endings are very different.

So why is the Dark Trio ending so far apart? It was all because they had mistaken Diga.
30 million years ago, Diga, Camilla, Durham, and Hitra were the Dark Giants Quad, Diga was the boss, and Camilla was Diga's lover. However, because of the pitiful persuasion of the Earth Guard, Diga abandoned the darkness and cast light, abandoned the darkness, embraced the light, and became a giant of light.
Light and darkness are antagonistic, and the trio of the once dark giants are formed as enemies of Diga. With his great strength, Diga defeated the three dark giants and seized their power. But after all, the other party is his lover and companion, so Diga did not give a dead hand, but chose to seal them.
The Diga, who had sealed his companions, adhered to the act of self-destruction without interfering with humanity, leaving behind the body of the battle, turning into light and leaving. Then, it's the passage of time. One day 30 million years later, the great ancient human being turned into light and entered the Diga Stone Statue, and Diga Ultraman is now revived.
However, the Diga at this time is not the Diga at that time.
The Diga itself, 30 million years ago, has long since left the earth. Diga 30 million years later, is the Great Ancient. Therefore, when the Dark Trio revived from the seal and tried to get Dagu to join them, they were rejected. Transformed into Dark Diga, Dagu began a battle with the Dark Triumvirate.
Camilla, Durham, and Hitra all mistakenly confessed to Digga, who they knew as Diga had long since left Earth. Now Diga is the Great Ancient, and they are strangers who have never known each other. So, when Diga defeats the Dark Trio again, the choice is to destroy them rather than seal them, because Dagu doesn't know them at all, only that they are the dark incarnations of destruction.
Ultraman will also recognize the wrong person, and the end is to be eliminated.