The ultimate fiery giant is formed by combining the strongest and most superior parts of the three titans: Gaiking's body, Raiking's arms, and Bulking's legs. It's sometimes nicknamed "Arajin" in the film's subtitles and insert songs.

While the fiery power it unleashes is 10 times that of a regular Gaiking, the pilot requires a corresponding level of strength, so its existence has been kept a secret only by Captain Garis and Sakon Shirou. However, thinking "maybe Dia can handle it now," Dia successfully combined the two and revealed itself to save her comrades who were in a difficult situation during the battle with Dvorak.

This machine incorporates the Great Combination in a way that makes use of Gaiking's unique mechanical design. There are also homages to past robot anime, such as the formation before combination, the internal mechanical structure shown at the moment of docking, and the appearance of the pilot wearing the helmet.

They only appeared three times in the film, as listed in the famous scenes section below, and one of those times was when they combined to rescue the imperial capital, so they only had two direct battle scenes, but there were hardly any scenes in the film where they struggled, and their heroic performance left a very strong impression on viewers.