Heisei Rider vs. Shōwa Rider: Kamen Rider Taisen feat. Super Sentai
is a Japanese superhero film featuring a crossover within the Kamen Rider Series, as well as the Super Sentai series. Scheduled for release on March 29, 2014, characters from all of the Kamen Rider Series, as far back as 1971's Kamen Rider up through the currently airing series Kamen Rider Gaim appeared, with many of the original actors reprising their roles, including Kamen Riders Hiroshi Fujioka. The film serves as a 15th anniversary commemoration of the Heisei period run of the Kamen Rider Series, and of Gaim being the 30th main Kamen Rider overall. The film features a battle between the Kamen Riders from the Shōwa period of Japanese history with the Kamen Riders from the Heisei period, orchestrated by the evil Kamen Rider Fifteen of the Badan Empire who has the powers of the 15 Heisei Kamen Riders at his disposal. Some warriors of the Super Sentai Series also enter the fray in the film's climax scene. In the lead up to the film, Toei allowed fans to vote on who would win in the film's climactic battle: the Shōwa Riders or the Heisei Riders. On opening day, it was revealed that the Heisei Riders won the vote by a narrow margin. The Shōwa Rider ending initially won the poll but it got an extension that allowed the Heisei ending to take the lead at the end. The ending with the Shōwa Riders winning was also featured on the home video release. On opening weekend, the weekly broadcasts of ToQger and Gaim were replaced by a one-hour special titled , serving as a prequel to the events of the film that explains the ToQgers' connection, the cause of the war, and the involvement of Ambassador Darkness and the Badan Empire. Plot The film opens with Zawame City ravaged by a fight between the Heisei Riders and the Shōwa Riders, before going back in time to the week before, when workers from the Yggdrasill Corporation are dragged by an unknown force to underground. Upon hearing rumors about it, Kota Kazuraba investigates the area with his friend Mai Takatsukasa, just to fall into a hole as well and find themselves in an underground, alternate version of the city. The two find a boy called Shu, who has the power to revert things and is certain that he has something important to do, but he does not remember what it is. Kota and Mai then bring the boy to the surface and Takeshi Hongo appears demanding them to hand him over, when soldiers from the Underground Badan Empire appear to kidnap him as well and Takeshi transforms into Kamen Rider One to allow Kota, Mai, and Shu to escape. Badan then launches an attack on the surface, and Armored Riders Baron, Ryugen, and Zangetsu Shin appear to fight back alongside Kota, who transforms into Armored Rider Gaim as well to protect his friends. However, Gaim is attacked by Kamen Rider Fifteen, who is also seeking the boy and also possesses a Lockseed