Speed Racer is a character from a cartoon by the same name. In Japan his name is Go Mifune. Speed is a race car driver who drives the amazing Mach 5. Speed hangs out with his girlfriend Trixie, his brother Spridle and Spridle's monkey Chim-Chim. Oh yeah, Speed also has a long lost brother named Rex Racer who secretly races under the name Racer X.