Super Den-O & Decade

A press release from Toei Company released on January 29, 2009, announced that there will be a fourth film for Kamen Rider Den-O. It was in production as of January 29, 2009, and is scheduled to be released in April 2009.[3] On February 9, 2009, Toei revealed that the title of the film would be Super Kamen Rider Den-O & Decade (超・仮面ライダー電王＆ディケイド, Chō-Kamen Raidā Den'ō ando Dikeido?), and the film was to be released on May 1, 2009. The film features Akina Minami as the bushi woman Toki (トキ, Toki?), the return of NEW Den-O from Final Countdown, and the eponymous Super Kamen Rider Den-O which appears as a variation of Den-O's Climax Form incorporating Wing Form's mask as wings. As the title suggests, characters from Kamen Rider Decade are also to be featured in the film, primarily Tsukasa and Natsumi. Other characters in the film include a yet unnamed evil Kamen Rider (using parts of the costume of Kamen Rider V3 from Kamen Rider The Next) and his footsoldiers (resembling the Gelnewts of Kamen Rider Ryuki).

This film begins the "Super Den-O" Series (「超・電王」シリーズ, "Chō-Den'ō" Shirīzu?), featuring the Tarōs, Deneb, Sieg, Jiro, Ramon, and Riki of Kiva, and Tsukasa and Natsumi of Decade.