Having developed the Rider System, based on the Joker's ability to copy sealed Undead, the organization BOARD (Board Of Archaeological Research Department) equips two young men, who become Kamen Riders: Kazuma Kenzaki and Sakuya Tachibana fight together as Kamen Rider Blade and Kamen Rider Garren to protect humans from Undead and seal them. Sinopsis Kamen Rider ZX Birth of the 10th! Kamen Riders All Together!!: Murasame Ryo, Kamen Rider ZX mencoba untuk menghalangi Badan untuk menciptakan alat penghancur dunia yang bernama Sistem Penghancur Luar Angkasa (Space Break System).Salah satu cara untuk menghadang rencana Badan ini adalah Menahan kapal yang membawa materi intinya yaitu Badanium 84.
The special opens with Tachibana Tōbei taking some children to a Kamen Rider roadshow. Just as he's reminiscing about all the heroic modified humans he's lived alongside- Ichigō, Nigō, V3, Riderman, X, Amazon, Stronger and Tackle- the first seven Riders gradually show up to greet him in their human guises, unrecognised by the crowds.
When it's revealed that the kaijin onstage are 'real', not actors, the Riders henshin to save the crowd and Rider actors, uniting their power to defeat the Delzer Army's true leader, Great General Darkness in his hideout beneath the stadium.