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Description
In the 2011 film OOO, Den-O, All Riders: Let's Go Kamen Riders, Kamen Rider #1 is a legendary figure whose immense power is turned to evil purposes for much of the story. He is the original cyborg superhero created by the terrorist organization Shocker, a man who was rebuilt into a grasshopper-themed warrior with incredible strength and speed. In the alternate timeline central to the film's plot, he and his fellow warrior Kamen Rider #2 have been defeated, brainwashed, and forced to become Shocker's elite soldiers, serving as the organization's most formidable enforcers in their mission to conquer the world.

Within this narrative, Kamen Rider #1, alongside Kamen Rider #2, initially appears as a powerful antagonist. He is shown effortlessly defeating Kamen Rider OOO, demonstrating the vast gulf in experience and ability between the original hero and his successors. His role is that of a tragic hero, a champion of justice turned into a weapon of oppression. His actions are not driven by his own will but by the control Shocker holds over him.

His most significant relationship is, of course, with Kamen Rider #2. The two are portrayed as inseparable partners, often fighting together in perfect sync. Their bond is so strong that they are freed from Shocker's brainwashing simultaneously by a scientist who had secretly been working to undo the damage. This moment marks a pivotal shift in the story, as they reclaim their identities as heroes. Once freed, they immediately rejoin the fight against their former masters, becoming crucial allies to Kamen Rider OOO and Kamen Rider Den-O. Their development is the central arc of their characters in the film: a fall from grace, a period of servitude under evil, and a triumphant redemption, culminating in a final battle where they fight alongside dozens of other Riders from across history.

As a combatant, Kamen Rider #1 is portrayed as a master of hand-to-hand combat, relying on a suite of devastating physical techniques. His signature abilities include the Rider Punch and the Rider Kick, a powerful leaping kick that is one of the most iconic moves in the franchise. His very presence on the battlefield is enough to turn the tide, and when he and Kamen Rider #2 perform their double techniques, such as the Double Rider Kick, they are nearly unstoppable. In the film's climax, Kamen Rider #1 delivers a line that encapsulates his restored purpose and the legacy he represents, telling the evil Great Leader to prepare for the judgment of forty years of justice.