in a new ice age. Mankind learns that ice aliens are responsible for the eruptions. The aliens are described as hideous with their skeletons and organs transparent through their icy bodies. The aliens drop nuclear bombs into additional volcanoes to further terraform the planet and enslave humanity. Gamera is freed from the Z-Plan rocket and returns to Earth as a battle breaks between humans and the aliens. Takahashi was inspired by the Jötnar from Norse mythology and the snow giants from The Conquest of the Pole, however, the ice creatures were redeveloped into Barugon. However, the ice giant idea was later redeveloped into Daimajin, dropping the ice element in favor of stone. Barugon's name was contracted from "Baru" (an aboriginal word for "crocodile's ancestor") and "Gon", derived from the English word for "dragon". The original screenplay had ideas and scene that were altered in the final film. The following are the noted differences. Barugon's back horns emitted different colors. The re-cap from the film's opening was added during post-production for audiences who had not seen the previous film. The script opened with Keisuke Hirata flying a Cessna with his instructor over Osaka, only to lose control due to radio interference. The scene then cuts to outer space where the Z-Plan rocket carrying Gamera nearly collides with a meteorite. Mission control manages to avoid a collision; however, the altered trajectory turns the rocket back to Earth and frees Gamera upon entering the Earth's atmosphere. Gamera's attack on Kurobe Dam intercut with Keisuke on the Cessna. The establishing shot of women practicing koto was not in the script. The dancing female natives were originally topless. The quicksand scene was not featured in the script. The script featured a discussion between Keisuke and Onodera regarding bringing Kawajiri's bones back to Japan, with Onodera insisting there was no time. A scene from the script featured Onodera making his getaway at night by hijacking Dr. Matsushita's jeep. The script had Gamera flying over Onodera's ship in Kobe Bay, triggering the opal to glow. In his haste to see Gamera, Onodera kicks over the infrared lamp towards his coat pocket holding the opal. When Keisuke and Karen arrive in Japan, the dialogue remains the same as in the final film, but the script had Keisuke panicking and Karen unveil the diamond at this stage. Onodera learns about the diamond through a radio report while still tied