仮面ライダーディケイドこと門矢士が訪れた、「とある世界」。そこでは、なぜか士の撮った写真は像を歪めることがなかった。 そんな士の脳裏に、突然ある洋館が思い浮かぶ。士がわずかな記憶を頼りに洋館にたどりつくと、そこには士の妹と名乗る少女・門矢小夜がおり、士はここが自分の世界だと確信する。 しかしこの世界でも「世界の崩壊」は進行していた。小夜に仕える月影ノブヒコは、世界の崩壊の原因が各世界に生まれたライダーたちにあると言い、それを止めるためには、「最強のライダー」をたった1人決めなくてはならないと告げる。
Jack Hollister, aka Skysurfer One, is an extraordinary skydiver who leads a group of vigilante crime fighters known as the Skysurfer Strike Force. Jack's mission is to seek out and defeat the robotic Cybron - a man with a computer for a brain who may have played a sinister role in the mysterious death of Jack's scientist father. The Skysurfers battle Cybron, and his bio-borgs, to stop his attempts at world domination and clear Jack's late father Adam's name, by using anti-gravity skyboards that fly on their own rocket power. This group of daredevils soars the skies at breakneck speeds and performs amazing acrobatic feats in their battle for justice. The Skysurfers use technologically advanced watches, Digitrans, that transformed them from their casual clothing to their battle attire and weapons; at the same time, their cars transform into rocket-powered surfboards that they can ride in the air.
