Japanese superhero crossover film between Kamen Rider OOO and Kamen Rider Fourze, and is the third Movie War. Serving to commemorate the franchise's fortieth anniversary, the film features supporting roles from Double and the first seven Kamen Riders, while Ryusei Sakuta makes an early-bird appearance as Kamen Rider Meteor ahead of his in-series debut. In the film, Eiji fights an evil Kamen Rider from the future while Gentaro befriends an extraterrestrial life-form who is being hunted by Foundation X.