Ep. 52: Speed and Sparky win the race after refueling and overcoming Racer X's interference
Aired on March 31, 1968

Speed and Sparky survive a crash and pursue other competitors. A sandstorm in the Sahara Desert buries the racers. On the final leg, Lovelace runs out of fuel, and Speed provides extra gas, leaving him empty. Racer X lectures Speed on professional duty over helping rivals, causing Speed to self-reproach. Sparky then spots a fuel tank left by Racer X. Refueled, they compete for victory. Speed wins the Around the World Grand Prix, becoming a World Champion Racer. Lovelace reveals her identity to her father and refuses marriage. Speed declares there are more races to win as he and Sparky continue racing.
Episodes
- Ep. 48 · Baron von Vondervon hosts a race for 17-year-old girls to find his missing daughter Ivonna.
- Ep. 49 · Speed uses balloons on the Mach 5 to escape a deserted WWII island
- Ep. 50 · Speed Racer and the Car Acrobatic Team face a dangerous grudge race orchestrated by international criminals.
- Ep. 51 · A billionaire sponsors a global race for gold and his daughter's hand in marriage.
- Ep. 52 · Speed and Sparky win the race after refueling and overcoming Racer X's interference