Kamen Rider × Kamen Rider W & Decade: Movie War 2010 (仮面ライダー×仮面ライダー Ｗ（ダブル）＆ディケイド MOVIE大戦2010 Kamen Raidā × Kamen Raidā: Daburu ando Dikeido Mūbī Taisen Nisenjū) is the name given to the commercial promotion for the December 12, 2009, theatrical releases of the Kamen Rider Decade epilogue film, the Kamen Rider W prologue/flashback film, and a third film that exists as a crossover between the two and serves as the finale to Decade. This film marks the first Movie War to be released annually.