Speed and Trixie drive to the shipyard where the Masked Racer's car is being unloaded for the upcoming Trans Country Race. Trixie hints to Speed that he should enter the race. He hesitantly agrees.
At the Racer homestead, while watching TV, Pops learns that Speed has entered the race. He "blows a gasket" and reminisces about the loss of his oldest son, Rex, who joined a race without his permission. At the brink of victory, Rex crashed the car Pops had built. Although Rex was uninjured, Pops refused to let him drive again, citing Rex's lack of experience. Consequently, Rex vowed never to return home.
Meanwhile, the Alpha Team is holding a secret conference to plot a way to win the race. Mr. Wiley tells Mr. Fixer and Alpha Team driver Zoomer Slick to "pull the dirty trick first."
Determined to beat the Masked Racer, Speed sneaks out in the middle of the night and goes to the track. Despite heavy rains he is not deterred. The Masked Racer warns him to stay out of the race.
Speed prepara-se para a corrida Trans Country. Mas o centro das atenções é o misterioso Corredor X, que na verdade é Rex, o irmão mais velho de Speed que há muito fugiu de casa após uma briga com Pops. Além da corrida, a dupla de heróis terá de enfrentar os competidores da Equipe Alfa, que pretendem vencer a qualquer custo.
素顔をマスクで隠し、正体が謎のベールに包まれた男・覆面レーサーが来日した。彼は海外のレースで名を馳せた一流のドライバーだったが、出場したレースでは必ず大事故が起こる不吉な男としても知られていた。
