Though the reprisal or the cameos of the Legend Hero Cast have not yet been confirmed. But here's the cast list who have been confirmed for now.
Syuichiro Naito as Touma Kamiyama / Kamen Rider Saber
Kiita Komagine as Kaito Goshikida / Zenkaizer
Takaya Yamaguchi as Rintaro Shindo / Kamen Rider Blades
Asuka Kawazu as Mei Sudo
Ryo Aoki as Kento Fukamiya / Kamen Rider Espada
Yuki Ikushima as Ryo Ogami / Kamen Rider Buster
Eiji Togashi as Ren Akamichi / Kamen Rider Kenzan
Hiroaki Oka as Tetsuo Daishinji / Kamen Rider Slash
Tomohiro Ichikawa as Yuri / Kamen Rider Saikou
Mei Angela as Reika Shindai / Kamen Rider Sabela
Ken Shonozaki as Ryoga Shindai / Kamen Rider Durendal
Atsuki Mashiko as Zocks Goldtsuiker / Twokaizer
Shintaro Asanuma as Juran / Zenkai Juran (Voice)
Yuki Kaji as Gaon / Zenkai Gaon (Voice)
Yume Miyamoto as Magine / Zenkai Magine (Voice)
Takuya Sato as Vroon / Zenkai Vroon (Voice)
Misato Fukuen as Secchan (Voice)
Rina Chinen as Sophia
Ikue Sakakibara as Yatsude Goshikida
Sadly, we don't have Hinami Mori as Flint nor Cutanner, Ricky's voice actors in the movie.
The movie will be directed by Ryuta Tasaki and the Screen Writer is Nobuhiro Mouri. Zenkaiger's Screen Writer Junko Komura also has her involvement in the movie for Zenkaiger's side of the story.
Jun Watanabe had taken over the torch of Action Director for Kamen Rider Series from Takeshi Miyazaki from Kamen Rider Zero-One. But exclusively for this movie, Takeshi Miyazaki is returning back as the Action Director.
Kamen Rider Saber's Opening & Ending Song Artist - Tokyo Ska Paradise Orchestra are going to perform the ending theme of the movie. It's titled "SPARK".
Chumei Watanabe & Kenichiro Oishi who are the Music Producer for Zenkaiger will also produce the music for Superhero Senki.