Born to race cars, Speed Racer (Emile Hirsch) is aggressive, instinctive and, most of all, fearless. His only real competition is the memory of the brother he idolized -- the legendary Rex Racer, whose death in a race has left behind a legacy that Speed is driven to fulfill. Speed is loyal to the family racing business, led by his father, Pops Racer (John Goodman), the designer of Speed's thundering Mach 5.