Aaron Gabow

Driving car number 9 (the "Shooting Star"), is the enigmatic Racer X, a mysterious soldier of fortune whose secret identity is that of Rex Racer, Speed's older brother, who years earlier had a falling out with the family and exiled himself. Estranged from his family, Rex assumed the Racer X identity to pursue his racing career without bringing shame to Pops. He stays in the background looking out for Speed Racer, often rescuing or assisting him. Yay!