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.
竹内涼真
as Shinnosuke Tomari / Kamen Rider Drive
松岡充
as Kamen Rider 4 (voice)
半田健人
as Takumi Inui / Kamen Rider Faiz
中村優一
as Yuto Sakurai / Kamen Rider Zeronos
小林豊
as Kaito Kumon / Kamen Rider Baron
萩野崇
as Takeshi Asakura / Kamen Rider Ouja
山本裕典
as Tsurugi Kamishiro / Kamen Rider Sasword
新納慎也
as King / Kamen Rider Dark Kiva
稲葉友
as Go Shijima / Kamen Rider Mach
Rio Uchida
as Kiriko Shijima
Chris Peppler
as Drive Driver (voice)
唐橋充
as Naoya Kaido / Snake Orphnoch
