Early morning, somewhere in Japan, a group of black three-wheeled cars approach a pagoda, which is called the Cupola Castle. Using some very sophisticated equipment, some very nimble men in black gain entry. They plant a miniature bomb in a suit of armor. During the Fujiyama Grand Prix, Racer X is gaining on Speed, who has the lead in the 30th lap. Unknown to Speed, Racer X is his older brother Rex who ran away from home years ago. Racer X comments that Speed's even better than the last time he raced against him. The Mach Five just edges out the Shooting Star to win the race.