
Speed and Annalise make it out of the track. Two vehicles from the original show- the Mammoth Car (from episodes 7 and 8) and the X3 make cameos in this episode. Meanwhile, Conor, Lucy, and X must find a way to get them out before the track eats itself up due to the virus, or they'll be stuck there forever. While Speed and Annalise are still stuck in the virtual track, they must put their differences aside to survive. After Speed suspects whats going on, he decides to investigate, but in the process, Speed, Annalise and the Mach 6 all get sucked into the virtual track. Thanks to Joel the lab technician, Zile takes over the virtual track to mess up Speed's race at the Redwood Rally so he doesn't survive. At the end of the episode, Speed receives a real note from their father. Meanwhile, Zile plans to have his birthday party. When he receives another letter asking for Speed to come meet him, Speed goes to figure out who the imposter is. Speed gradually receives mysterious notes signed by his father, but he suspects that they could be false.

Meanwhile, Zile plans to ruin Speed and X's teamwork during the tournament and destroy the Mach 6. Speed and X must work together as a team in order to win a multi-school racing tournament. When Annalise sees X not taking this seriously, she stands up and sabotages Speed's car so X can win. A crazy stalker student named Mitch spreads a rumor that Speed will have a rivalry race with his brother, X, which spirals into a real race. Speed takes advice from X on how to deal with the fame of being Speed Racer's son from his classmates. NOTE: The three-part special aired on Nickelodeon on March 14, 2009. Speed uses the new car to race once again against Annalise, and wins. Speed and his friends discover the secret plans to build the Mach Six and its unique engine from the remains of the Mach 5.

Spritle reveals a shocking surprise to Speed that he is Speed Racer's son and is X's long lost brother. However, Annalise, under Zile's orders, destroys it in a match against X. Speed and his friends rebuild the Mach Five and test it out. Having destroyed the car, his key, which was left to him by his mysterious father, glows, and leads him to find the Mach Five's hood disassembled from the other pieces of the car. With no race car of his own, Conor lets him use a junky, spare one for the Qualifying Race, known as "LOST HERO".

Speed arrives at the Racing Academy and meets all of the main cast.
