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Official Site: Toei Company

is the primary protagonist and eponymous character of the 1974 Kamen Rider Series Kamen Rider X. His design was based on the Belostomatidae or "Giant water bug", and the letter X. He is also known as and is the fifth Rider after Riderman.

Rider X also made his appearance in the Kamen Rider Super-1 Movie, Birth of the 10th! Kamen Riders All Together!!, and Kamen Rider Black RX. He also appears in Kamen Rider Decade and its movie, Kamen Rider Decade: All Riders vs. Dai-Shocker.

was the son of Robotics scientist Keitarō Jin who was devising the technology for undersea exploration. However, Keisuke and his father were attacked by Neptune of the G.O.D. organization which wanted the technology for their use. As a result, Keisuke suffered mortal injuries inflicted from the ordeal with his father forced to perform surgery on his son with what little of his inventions to make his son into a to save his life before he succumbed to his own injuries. Driven to avenge his father's death and save the world, Keisuke battles G.O.D.

For the first 27 episodes, Keisuke's used the phrase and jumps into the air with his bodysuit manifesting as he removes the "Redizer" & "Perfecter" from the sides of his belt to form his helmet and then snap up the faceplate to complete the transformation. From 28 onward, Keisuke uses the phrase to transform while making a "X" sign with his arms.

Kamen Rider X has not been a contender in any CBUB matches.