Hiroko Saito

Professor Daidōji has developed a gravity machine called the GX Device. Unfortunately, Shocker wants it; so they attack the professor and destroy his laboratory, but come home empty-handed. Shocker's agents find out that the plans for the GX Device are with Daidōji's daughter, who is celebrating her birthday. Now the Kamen Riders, along with FBI agent Kazuya Taki, must protect Daidōji's daughter and prevent Shocker from obtaining the plans.

A female scientist and two children are accidentally transported into a future dominated by primates.

The moth-like superhero Inazuman has the climactic battle with Emperor Bamba and the Neo-Human Empire Phantom Army while also confronting the rise of President Geisel and the Desper Corps. An alternate version of events depicted in the TV series, exhibited theatrically in 3-D.