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.
as Hayato Ichimonji / Kamen Rider #2
as Takeshi Hongo / Kamen Rider #1
as Tobei Tachibana
as Kazuya Taki
as Dr. Shinigami
as Yuri
as Emi
as Mika
as Goro
as Dr. Daidōji
as Assistant Ano
as Tamami Daidōji
as Zanjioh (voice)
as Narrator (voice)
