Kamen Rider 4 is a web series which was released as an accompanying special to the film Super Hero Taisen GP: Kamen Rider 3. It introduced a new rider, Kamen Rider 4, who is the fourth Kamen Rider cyborg created by Shocker after Kamen Riders 1, 2, and 3. The plot goes around a time loop created by the Shocker that resets whenever someone dies, but whenever the loop resets Shocker itself somehow grows stronger and stronger. Thus, it is up to the Riders to decide whether to keep on fighting a useless battle... Or end the loops for good by sacrificing one of their own.
Kyouhei Yamaguchi
Director
Nobuhiro Mouri
Writer
Ryoma Takeuchi
Shinnosuke Tomari / Kamen Rider Drive
Mitsuru Matsuoka
Kamen Rider 4 (voice)
Kento Handa
Takumi Inui / Kamen Rider Faiz
Yuichi Nakamura
Yuto Sakurai / Kamen Rider Zeronos
Yutaka Kobayashi
Kaito Kumon / Kamen Rider Baron
Takashi Hagino
Takeshi Asakura / Kamen Rider Ouja
Yusuke Yamamoto
Tsurugi Kamishiro / Kamen Rider Sasword
Shinya Niiro
King / Kamen Rider Dark Kiva
Yu Inaba
Go Shijima / Kamen Rider Mach
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