OOO, Den-O, All Riders: Let's Go Kamen Riders is a superhero film that was released on April 1, 2011, to commemorate the 40th anniversary of the Kamen Rider franchise. While the film features all of the franchise's protagonists, the main heroes of the original Kamen Rider TV series, Kamen Rider Den-O, and Kamen Rider OOO serve as the main characters. The film's subtitle "Let's Go Kamen Riders" is an homage to the theme song of the original series, "Let's Go!! Rider Kick".