Movie War Mega Max featured the first seven Kamen Riders (Kamen Rider 1, 2, V3, Riderman, X, Amazon, and Stronger) to commemorate the franchise's 40th anniversary. Trailers for the film shown during airings of Fourze also showed the return of Kamen Rider Double as well as a new form for Kamen Rider OOO. Unlike previous Movie War films, where they were divided into 3 segments, Movie War Mega Max is divided into 5 parts. Like previous Movie War films the secondary Kamen Rider of Kamen Rider Fourze, Kamen Rider Meteor, made his debut in the film.
Sota Fukushi
Gentaro Kisaragi / Kamen Rider Fourze
Shu Watanabe
Eiji Hino / Kamen Rider OOO
Renn Kiriyama
Shotaro Hidari / Kamen Rider W / Kamen Rider Joker
Masaki Suda
Philip / Kamen Rider W
Ryosuke Miura
Ankh
Erina Mano
Nadeshiko Misaki / Kamen Rider Nadeshiko
Tetsu Inada
Kamen Rider 1 (voice)
Takahiro Fujimoto
Kamen Rider 2 (voice)
