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* History is incomplete.
The Headless Biker was the disguise of Mr. O'Brien.
He looked like a headless kid wearing a gray suit, holding a pumpkin with carved out red eyes. He also used a bicycle.
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Skills and abilities
The Headless Biker could ride a bicycle.
Scooby-Doo! (DC Comics)
Mr. O'Brien really wanted his son to win the contest, so he dressed up as the headless biker to scare off the other racers, so his son could win easily.