Ep. 10: Speed faces a deadly mountain curve and treacherous chasms during the dangerous race
Aired on June 4, 1967

Speed struggles to prepare his Mach 5 and barely arrives at the start. His brakes fail on a sharp mountain curve, requiring Sparky and Trixie to rescue him. Upon rejoining the race, the drivers encounter heavy rain that destroys road overhangs, forcing them to leap across dangerous chasms. While Snake Oiler and Racer X successfully clear the gaps, Speed’s vehicle crashes into a canyon during the attempt. Amid the wreckage and fatalities caused by the storm, only a small doll from his younger brother Spritle remains as evidence of Speed’s presence.
Episodes
- Ep. 6 · Speed evades Blaggard, reveals treasure location, and rescues Mr. Clepto with help from Racer X.
- Ep. 7 · Inspector Detector investigates stolen gold while Racer X defends against motorcycle attackers.
- Ep. 8 · Speed and Trixie escape the Mammoth Car drivers and confront Cruncher Block at his mining tunnel headquarters.
- Ep. 9 · Speed Enters the Dangerous Great Alpine Race Despite Warnings from Sparky and Racer X
- Ep. 10 · Speed faces a deadly mountain curve and treacherous chasms during the dangerous race
- Ep. 11 · Speed survives with concussion and blindness while Racer X fakes injury to help him.
- Ep. 12 · Speed encounters a mysterious car linked to the Three Roses Club's past victim during a test session.
- Ep. 13 · Lilly drives the rebuilt Melange to target the Three Roses Club members
- Ep. 14 · Speed and Spritle face false blame and rebel capture in the desert race