Race Around the World (Part 2)
Speed and Sparky survive the crash and quickly catch up to the other racers. Speed saves Lovelace from an ice crevice in Antarctica. In Sahara, a wind storm buries the races in the sand. On the last leg of the race, Speed gives Lovelace some of his gas. After Speed runs out of gas, Racer X shows up and gives Speed a lecture about his duty to win as a professional racer vs. his desire to help his competitors, and leaves a gas can. Speed wins the race becoming world champion race and Lovelace reveals herself to her father.
Aired 15/03/1968EP 52 - Race Around the World (Part 2)

Speed Racer
The Mach 5 is one of the fastest and most technologically advanced race cars built by man. Equipped with various gadgets and a powerful engine, it provides a challenge for anyone who would dare race against it. The driver of this amazing vehicle is Gou Mifune, a teenager who dreams of breaking into the world of professional racing.
In spite of this, Gou's father and the creator of the Mach 5, Daisuke Mifune, does not want his son anywhere near a racetrack. Undeterred, his girlfriend Michi, younger brother Kurio, and Kurio's monkey sidekick Sanpei become Gou's biggest fans as he sets out to become the greatest racer of all time.
However, Gou soon learns that becoming a professional racer is not easy. From the underhanded plots of corrupt businessmen to stiff competition in the form of his rival, Racer X, Gou faces many obstacles on the road ahead, and has a lot to prove before he can cross the finish line.
(Source: MAL Rewrite)