A Decade Timeline theory
DaiShocker World (Decade World) - Tsukasa Kadoya is the supreme leader of DaiShocker, an alliance of Kaijins* who wants to prove the superiority of their race by killing Earth’s heroes, the Kamen Riders.
- Tsukasa creates Kamen Rider DECADE’s powers, a humanoide able to take the shape of Earth’s heroes to destroy them more easily.
- Malfunction of Kamen Rider DECADE’s powers, when Tsukasa kills Earth’s heroes, he loses memories.
- Rider War (cf. Episode 1). All The Riders defend their Worlds against the demon that wants to destroy them all.
- Kamen Rider DECADE vs Kamen Rider KUUGA Ultimate Form.
- Total loss of Tsukasa’s memories because of the impact during the fight against KUUGA, as well as the loss of his DecaDriver and RideBooker.
- Arrival in Natsumi World.
- The Worlds start to collide.
- Tsukasa meets Natsumi, the adventure starts.
- When Tsukasa regains his powers, he regains memories. It’s possible that the Tsukasa of the current episodes plays an act (Because he regained some memories thanks to KUUGA through DEN-O’s Worlds’ powers.) to regain all his powers in Hibiki World and as soon as he’s regained his full memory, go wild again.
- Hibiki World ? - The memory is completely unlocked thanks to Complete Form. Tsukasa loses control.
- Movie (Unknown World) - ShadowMoon (Rival of Kamen Rider BLACK and BLACK RX) is the new supreme commander of DaiShocker. His subordonates are Doctor Shinigami (Evil twin of Natsumi’s Grand-father in this World.) as well as the Hell Ambassador.
- The Showa Riders will be alternative versions, just like the Heisei Riders in the series.
- End of the season. Possible season 2.
- Kamen Rider W.