Royalton, CEO of conglomerate Royalton Industries, offers Speed an astoundingly luxurious lifestyle in exchange for signing to race with him. Though tempted, Speed declines because his father's distrust of power-hungry corporations. Angered, Royalton reveals that for many years, key races have been fixed by corporate interests, including himself, to gain profits. Royalton takes out his anger on Speed by having his drivers force Speed into a crash that destroys the Mach 6 and suing Racer Motors for intellectual property infringement. Speed gets an opportunity to retaliate through Inspector Detector, head of an intelligence agency's corporate crimes division. Racer Taejo Togokahn supposedly has evidence that could indict Royalton but will only offer it up if Speed and the notorious masked Racer X agree to race on his team in the upcoming Casa Cristo 5000, which could also substantially raise the stock price of his family's racing business, blocking a Royalton-arranged buyout. Speed agrees but keeps his decision secret from his family, and Detector's team makes several defensive modifications to the Mach 5 to assist Speed in the race. After they drive together and work naturally as a team, Speed begins suspecting that Racer X is actually Rex in disguise. His family discovers that he has entered the race and agree to support him, though Pops is angry with him for not asking permission to race earlier. With his family and Trixie aiding him, Speed defeats many brutal racers, who were bribed by fixer Cruncher Block to stop him, and overcomes seemingly insurmountable obstacles to win the race, while Detector's team arrests Block. However, Taejo's arrangement is revealed to be a sham, as he was only interested in increasing the value of his family's company to profit from Royalton's buyout. Enraged, Speed hits the track that he used to drive with his brother, and confronts Racer X with his suspicion that he is Rex. Racer X removes his mask, revealing an unfamiliar face, and tells Speed that Rex is indeed dead, but advises Speed to not let racing change the way he is and figure out his own driving. Speed returns home and plans to leave, but Pops expresses his pride in Speed's actions, and that he was wrong to not let Speed enter the race since his own stubbornness drove Rex away, before finding out about the race-fixing conspiracy. Taejo's sister Horuko unexpectedly arrives and gives him Taejo's rejected automatic invitation