Kamen Rider: Reiwa The First Generation (仮面ライダー 令和 ザ・ファースト・ジェネレーション, Kamen Raidā Reiwa Za Fāsuto Jenerēshon) is a Japanese superhero crossover film between Kamen Rider Zero-One and Kamen Rider Zi-O, serving as the 11th Movie War, tribute to the original Kamen Rider series, and the 4th installment of the Generations Series. In the film, Aruto and Sougo fight the Time Jacker Finis, who has invaded the World of Zero-One and altered its timeline. Kamen Rider Thouser makes a brief appearance in the film ahead of his in-series debut.