Deputy Officer of the United Nations Alliance, Simon Marcus, who aims to conquer the world with the terrorist organization Downfall along with the mad scientist Keiji Uraga, attack the Kamen Riders with overwhelming strength. It is only on Kamen Rider Grease that the enemy's abilities did not work. In order to defeat this new enemy and rescue Misora, Kazumi Sawatari must create a new item ... but it is told that it requires the life of his friends, the Three Crows. The ultimate decision must be made.
as Kazumi Sawatari / Kamen Rider Grease
as Simon Marcus / Phantom Crusher
as Keiji Uraga
as Misora
as Sento Kiryu / Kamen Rider Build
as Ryuga Banjou / Kamen Rider Cross-Z
as Sawa Takigawa
as Gentoku Himuro / Kamen Rider Rogue
as Nariaki Utsumi / Kamen Rider MadRogue
as Takumi Katsuragi
as Taizan Himuro
as Akaba
as Aoba
as Kiba
as Shinobu Katsuragi
as Massugu Ubukata
as Keiji Uraga / Kamen Rider Metal Build
