My edition or the Riders' War arc:
Scene is at a canyon. Great Shocker was finally crumbled, thanks to Decade, Kuuga and Diend.
The original Wataru appeared to congratulate and thank him for saving all the worlds. Suddenly, a figure creeped out from nowhere. It's our ever-loving, Decade-obsessed stalker, Narutaki~
Mumbling his favorite line, "darn you, Decade!", he handed Wataru a photo. Once Wataru took a look at it, his face turned hostile-looking.
"See? Toldya that Decade IS the nexus of destruction to all Rider Worlds", grinned Narutaki.
Wataru said, "Transform!", and transformed into Kiva.
Flinging the photo angrily towards Tsukasa, the latter picked it up and realize what the pic is about - it's the picture of the infamous image that's been lurking in the previous pages, making the guys in this forums drooling happily~
Wataru growled, "Never, ever, has any Riders gotten so lucky before!!!!"
Then the smirk Narutaki opens up multiple inter-dimensional portals. Out came every new generation Riders you can imagine. Seems Narutaki developed a great number of copies of the photo and showed to everyone.
*scene cuts to Grandpapa and Kivara counting the money from the mass developing job from Narutaki*
*scene cuts back to the canyon*
The Riders and pseudo-Riders all stepped out of the portals, looking pissed. (OK, technically they were all wearing helmets, but you can tell from their bodily gestures)
Some of the more desperate ones (a-la Rito Troopers), couldn't resist the temptation and cornered Natsumi, making her fall and dirtied her white dress.
No choice, and knowing explanations won't do any good, Tsukasa transforms, and behold! The starting scene from episode one~