第 7 集: Inspector Detector 調查黃金失竊案，Racer X 則抵禦摩托車襲擊者。

When Trixie was granted the position of Speed's assistant in the No Limit World Race, Inspector Detector and his officials search each entry, looking for $50,000,000 in stolen gold bars before the race begins. When the Mammoth Car enters the track, its driver gives the Inspector a tour, showing no trace of the gold. When the race begins, the Mammoth Car forces everyone off the road, making Speed a bit suspicious. On its way to discover the Mammoth Car’s secret, he equips the homing robot with X-ray film so he can be able to penetrate the metal. The robot is shot at and returns home broken. Now, the Mammoth Car catches up to Speed and forces the Mach 5 off the road. When a ramp is lowered, a squad of motorcyclists descends onto the road. Racer X appears and spills oil on the road, causing the bikers to crash. At the airport, Spritle and Chim Chim stow away aboard Cruncher Block's airplane. Meanwhile on the road, the Mach 5 and the Mammoth Car both collide and veer off the road towards the forest. While Speed uses his rotary saws to cut down the trees, the Mammoth Car's power mows its own path. Speed turns around and tries to slash the car’s tires, but the Mammoth Car dodges it and encircles the Mach 5. Guns emerge from its sides. Speed closes the cockpit to block the shower of bullets and escapes through a gap and plunges into a lake.

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