The GRX Appeared in the two part episode "The fastest car on Earth"
About this creation
Reference pic of the GRX
The GRX is actually the name of the engine not the car. In the original Japanese version the car was known as "Great Kuron" the GRX was built by Ben Cranem 10 years prior to the events in this episode. the GRX was so powerful no driver could handle it. After killing 5 drivers including it's creator, It was buried with Ben Cranem . Oriana Flub finds out about the engine , and recovers it. she has the engine placed in a sleek car to enter it in the Grand Prix.
After Towcar is nearly killed Ben Cranem's son Curly Cranem (pictured) is hired by Flub to drive the car.
Speed just can't keep up with the GRX
During the race Curly loses control of the Car and crashes, becoming the 6th person killed by the GRX.
Henchmen 1, Oriana Flub, Omar, and her driver Lumus Towcar