Kamen Rider x Kamen Rider Fourze & OOO Movie War Megamax

Kamen Rider x Kamen Rider Fourze & OOO Movie War Megamax is the upcoming crossover film between Kamen Rider OOO and Kamen Rider Fourze in the same vein as the Movie War 2010 and Movie War Core

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films. The film is set to be released in theaters on December 10, 2011 in Japan. Movie War Megamax has featuring seven Shōwa Riders:

• Kamen Rider #1
• Kamen Rider #2
• Kamen Rider V3
• RIderman
• Kamen Rider X
• Kamen Rider Amazon
• Kamen Rider Stronger

There are also showing the return of Kamen Rider W in the trailer durinairings of Kamen Rider Fourze as well.
The Kamen Rider OOO portion of the film introduces the main antagonist Miharu Minato (湊 ミハル Minato Miharu^?) who transforms into Kamen Rider Poseidon (仮面ライダーポセイドン Kamen Raidā Poseidon^?) through a trio of marine life-themed Core Medals.^[1]With the destruction of all of the original Core Medals, Eiji Hino must find a way to defeat Kamen Rider Poseidon without the ability to transform into Kamen Rider OOO and Ankh at his side.
In the Kamen Rider Fourze part of the film, Gentaro Kisaragi falls in love with transfer student Nadeshiko Misaki (美咲 撫子 Misaki Nadeshiko^?). However, she can transform into Kamen Rider Nadeshiko (仮面ライダーなでしこ Kamen Raidā Nadeshiko^?) with abilities similar to Kamen Rider Fourze.