The Dangerous Witness
Speed, Trixie, Spritle and Chim Chim are flying to Hong Kong for the Hong Kong International Race. Speed notices a woman passenger acting mysteriously as she plays with her compact. The compact is actually a sophisticated weapon which fires a poisoned dart at a another passenger sitting further back in the plane. As Speed tries to question the woman, she collapses because she has been hit with a similar poisoned dart. We see the stewardess in the back of the plane with an evil smirk. Chim Chim hands Speed an invitation to one of Hong Kong's floating restaurants. The invitation fell out of the woman's purse. Speed is accosted by a group of reporters as he gets off the plane, but they split immediately when Princess Petal's plane lands. She is a mysterious princess from the Kingdom of Blossombow in the Middle East. Speed puts his foot in it when he admires the princess for her elegance. An assassin has her sights on the princess, but she is restrained by the stewardess who cautions her t
Aired 09/02/1968EP 43 - The Dangerous Witness

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)