Kamen Rider W Returns (仮面ライダーW(ダブル) RETURNS, Kamen Raidā Daburu Ritānzu) is a set of two V-Cinema (direct-to-video) releases that serve as spin-offs of characters from the Kamen Rider W television series and films. These films focus on the characters of Ryu Terui (Minehiro Kinomoto) as Kamen Rider Accel and Katsumi Daido (Mitsuru Matsuoka of SOPHIA) as Kamen Rider Eternal. The series' main protagonists Shotaro Hidari (Renn Kiriyama), Philip (Masaki Suda), and Akiko Narumi (Hikaru Yamamoto) also are featured in each film. Koichi Sakamoto directs both films, with Keiichi Hasegawa writing the Accel portion and Riku Sanjo writing the Eternal portion. Kamen Rider Accel was dedicated to the memory of Minoru Tanaka, who portrayed Hiroshi Sagami within the film.
Kamen Rider Accel (仮面ライダーアクセル, Kamen Raidā Akuseru), released on April 21, 2011 (with rentals out on April 8), is a story set after the events of Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core.
Kamen Rider W (仮面ライダーW(ダブル), Kamen Raidā Daburu, also called Kamen Rider Double) is a 2009-2010 Japanese tokusatsu drama, the eleventh series in the Heisei period run of the Kamen Rider Series. It premiered following the finale of Kamen Rider Decade on September 6, 2009, and aired alongside Samurai Sentai Shinkenger in TV Asahi's Super Hero Time programming block. Following Shinkenger's finale, it aired alongside Tensou Sentai Goseiger, until W concluded on August 29, 2010. The series is described as the "Heisei Kamen Rider 10th Anniversary Project: Fall Campaign" (平成仮面ライダー10周年プロジェクト 秋の陣, Heisei Kamen Raidā Jusshūnen Purojekuto: Aki no Jin). In the first episode of Kamen Rider Fourze, W is revealed to be canon to the original Showa timeline, making it the first series to do so since Kamen Rider Agito.
The catchphrases for the series are "We are the two-in-one Kamen Rider" (俺たちは/僕たちは、二人で一人の仮面ライダーさ, Ore-tachi wa/Boku-tachi wa, futari de hitori no Kamen Raidā sa) and "This clinches it!" (これで決まりだ!, Kore de kimari da!).