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.
Takeshi SasakiHayato Ichimonji / Kamen Rider #2
Hiroshi FujiokaTakeshi Hongo / Kamen Rider #1
Akiji KobayashiTobei Tachibana
Jirô ChibaKazuya Taki
Hideyo AmamotoDr. ShinigamiWakako OkiYuriEmily TakamiEmiYoko SugibayashiMikaYasuharu MiuraGoro
Hajime IzuDr. DaidōjiHiroyuki MiyaAssistant AnoHiroko SaitoTamami Daidōji
Mahito TsujimuraZanjioh (voice)
Shinji NakaeNarrator (voice)
