Dex, a teenage boy from a world light years away, is forced to flee his planet in the wake of devastation caused by Count Dregon, the supreme warlord of the universe. His next target destination: planet Earth. Using newly acquired powers, Dex can transmutate into the powerful Masked Rider or the nearly invincible Masked Rider Super Gold. Masked Rider is Earth's last defense against the most sinister and destructive force in the universe.