
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.
Cast

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)

Hirofumi Tanaka
Kamen Rider V3 (voice)

Takayuki Masuda
Riderman (voice)

Isshin Chiba
Kamen Rider X (voice)
Koji Tobe
Kamen Rider Amazon (voice)

Hideo Ishikawa
Kamen Rider Stronger (voice)

Riho Takada
Hina Izumi
Marie Kai
Chiyoko Shiraishi

Mayuko Arisue
Erika Satonaka

Hiroaki Iwanaga
Akira Date / Kamen Rider Proto-Birth

Asaya Kimijima
Shintaro Goto / Kamen Rider Birth

Jouji Nakata
Birth Driver (voice) / Birth Buster (voice)

Akira Kushida
O Scanner (voice) / Poseidon Driver (voice) / GingaOh Driver (voice)

Kenji Hamada
Kamen Rider Poseidon (voice)

Atsushi Arai
Miharu Minato / Kamen Rider Aqua

Takashi Ukaji
Kōsei Kōgami

Fumihiko Tachiki
Gaia Memory (voice)
Dante Carver
Katal

Sanae Hitomi
Solaris
Azusa Watanabe
Chancellor Kiima

Toru Masuoka
Lem Kannagi

Ryuki Takahashi
Kengo Utahoshi

Yoshiko Sengen
Yūki Jōjima

Justin Tomimori
Shun Daimonji

Rikako Sakata
Miu Kazashiro

Shiho
Tomoko Nozama

Shion Tsuchiya
JK

Takushi Tanaka
Chūta Ōsugi

Shingo Tsurumi
Mitsuaki Gamō

Rie Tanaka
Virgo Zodiarts (voice)

Ryo Yoshizawa
Mysterious student
Crew

Koichi Sakamoto
Director, Action Director

Yasuko Kobayashi
Screenplay

Kazuki Nakashima
Screenplay
Hiroshi Sunaga
Editor
Koji Kurata
Director of Photography

Kazuya Kamihoriuchi
Assistant Director
Yoo Nakano
Storyboard
Noboru Sugiyama
Executive Producer
Takeyuki Suzuki
Producer
Takashi Hirajo
Producer
Nagao Niita
Producer
Yoshihiko Shinoda
Producer
Naoya Kinoshita
Producer
Yoshitaka Tao
Producer

Hideaki Tsukada
Producer

Naomi Takebe
Producer

Kazuhiro Takahashi
Producer
Kengo Motoi
Producer

Hiroshi Butsuda
Special Effects
Shuhei Naruse
Music

Kotaro Nakagawa
Music

Jun Watanabe
Stunts
Satoshi Fujita
Stunts

Masashi Takada
Stunts
Ryō Yokata
Stunts
Jiro Okamoto
Stunts

Eitoku
Stunts

Seiji Takaiwa
Stunts

Sanae Hitomi
Stunts
Tatsuro Koike
Stunt Coordinator
Michitaka Kikuchi
Creature Design

Yutaka Izubuchi
Creature Design
Tamotsu Shinohara
Creature Design
Hideki Tajima
Character Designer
Masato Hayase
Character Designer
Daisuke Kobayashi
Character Designer
Osamu Abe
Character Designer
Satoshi Kunida
Character Designer
Kyoryu Kuramochi
Character Designer

Shotaro Ishinomori
Original Story

Marty Friedman
Theme Song Performance
Shō Ayanokōji
Theme Song Performance
Shuichi Oshima
Art Direction
Recommendations
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Kamen Rider W Forever: A to Z/The Gaia Memories of Fate

The Last Duel

I Spit on Your Grave III: Vengeance Is Mine

Heaven in Hell

Fantasy Island

Dune

Armor

S.W.A.T.: Under Siege

13 Exorcisms

Deadstream

The Goldman Case

The Execution

Hangman

Boudica

Oppenheimer

The Children's Train

Julieta

Baghead

Weapons

He's Out There