Episode 6 of "Motorheads" kicks off at yet another racing event masterminded by Ray. Zac, eager to prove his mettle, expresses his desire to compete, but Ray remains skeptical, believing Zac is still too cautious to cut it in the fast lane. Zac stands his ground, insisting that he harbors the potential to be a force to be reckoned with and craves the thrill of real competition, not just against Ray's timing device. Unyielding in his pursuit, Zac finally secures a promise from Ray to let him race the following day.
In the garage atmosphere, Cate hovers anxiously over Curtis as they meticulously rebuild an engine. Meanwhile, Logan grapples with understanding a new system upgrade in his own workspace, until Cate steps in to lend her expertise. At school, Alicia extends an invitation to Zac for a White Knuckle Run, only to be politely declined as Zac is committed to an online racing competition—a commitment that later transpires to be a clever ruse.
Marcel's world turns upside down when he learns he must live with his mother for three months due to his father's involvement in a diner window-smashing incident. His friends, seeking to celebrate their time together, decide to take Marcel to the knuckle race as a bittersweet farewell. Amongst the preparations, Cate feels an unease lingering around Curtis and Brooke's close interactions.
Zac's revelation that the online race was a fabrication to avoid disclosing his actual plans with Ray leads to a confrontation. When Zac informs Ray of his decision not to race the next day, Ray's fury boils over. He dismisses Zac curtly, telling him to vacate his premises and reminding him of the debt owed: a car.
Logan, concerned for Marcel's mother's wellbeing, decides to make the journey to Shippensburg to assess the situation. Sam, empathizing as a mother herself, offers to accompany him. During the trip, they reminisce about Christian's debut race—a rookie who showed such prowess that seasoned racers reconsidered their careers. Logan reflects that Christian could have been the greatest race car driver and an exemplary father. Elsewhere, Hugo seeks Ray's assistance in tackling wheel jackers terrorizing the town.
At the race event, Brooke reluctantly loans Marcel her drone for the day's festivities. Cate notices that some racers are acquainted with Zac, taunting him with the moniker "groupie," a nickname he chooses not to explain. Zac learns that the race involves a against-the-clock challenge, stirring within him a longing to participate, given his dirt bike racing experience. Later, Cate's jealousy flames up as she realizes Brooke's growing infatuation with Curtis, observing their interactions with a mixture of envy and frustration.
Zac engages in a profound dialogue with one of the racers, labeling him a mere groupie. She scoffs at his reliance on his father's legacy, reminding him that Christian Maddox stood unrivaled. She emphasizes that true victory necessitates embracing the risk of defeat. Motivated by Harris' triumph in one minute and fifty-six seconds, Zac is spurred to take the challenge himself.
Elsewhere, Ray tracks down the car wheel thieves for his father, hoping for a camaraderie-filled beer session, only to be politely declined. Meanwhile, Logan and Sam arrive at Marcel's mother's residence, where her enthusiasm for hosting Marcel is notably absent. She admits her willingness is solely motivated by the state check, unaware that Cheri, as Marcel's biological mother, receives no such financial assistance.
Back at the track, Cate mentors Zac through the race, her nerves jangling as she advises caution at the final, perilous turn. Zac, however, opts to gun the engine, sending Cate into a fit of apprehension that he might crash. To her relief and astonishment, Zac crosses the finish line, shaving a second off Harris' record. His exhilaration about courting danger prompts Curtis to suspect that Zac might have been secretly training with Ray. Cate reassures Curtis that Ray's training sessions have concluded, though Curtis remains skeptical.
Post-race, Curtis seeks Ray out to inquire about his intentions concerning Zac. Ray confesses he sees potential in Zac, hinting that their journey together will be contingent upon Zac's prowess. Meanwhile, Marcel finds refuge with Logan and Sam after his mother refuses to house him, with the duo fibbing that her decision was based on his academic and social commitments.
The wheel-thieving ring turns out to be led by Ryan, Ezra's daughter and the same individual who aided Zac in his victory. Hugo's memories drift back seventeen years, to a harrowing escape from the police where a bleeding Ezra faced a dire choice. Hugo's suggestion for Ezra to surrender for medical aid resonates deeply. Ryan ponders Hugo's unwavering support, hoping one day to uncover the underlying reason.
The episode concludes with Harris storming into the garage, issuing a race challenge to Zac. Zac, unwilling to compete in any other vehicle, insists they await the completion of their car. Despite needing at least three months, Cate vows they'll be race-ready in just three weeks.
