[Dude Delaney], a 1950s greaser, hurls himself into a high-speed chase with the local cops, Sarge and his unnamed partner, until a brutal game of chicken ends in a crash that shatters the quiet rhythm of the town. He drifts to a nightclub with his girlfriend Donna, whose patience wears thin as she tolerates his loud rock passion and the long wait they’ve endured. After a sweaty, rebellious dance, the couple is joined by Nixer, whose presence irks Donna, hinting at tensions beneath the surface.
The trio roams the streets, chasing a sense of direction, until they cross paths with Teddy Leather, a rival greaser, and his group. A string of taunts escalates into a drag race that ends in chaos: Dude flicks a cigarette, it lands in Teddy’s girlfriend’s hair, and the blaze forces everyone to scramble. Teddy and his crew swear revenge as the car speeds away, leaving a rekindled fury in its wake.
Back at the diner, Sarge surfaces again, warning of arrest but choosing to bide his time for a charge that would lock the boy up. He privately scolds Teddy for letting Dude bait him into humiliation, pressing Teddy to tighten his grip on authority before the rest of the town starts questioning theirs. The tension spills over when Teddy corners Dude and Nixer at J.T.’s diner, only to have the situation defused by the wary owner. When Teddy confronts Dude in a street-fight frame, a reminder that Teddy has a date with his friend’s sister cools the moment, and Dude quietly schedules a date with Donna at a nearby roller rink.
Donna is irritated to find Dude at the rink, and Teddy’s harassment at the diner rekindles a possibility of violence. Sarge steps in and breaks up what could have become a public switchblade clash. The pressure tightens as Sarge, fed up with Teddy’s bungled grip on the situation, hands him a pistol and orders him to resolve it—privately, so the murder won’t implicate him. Caught between the lure of his music and the pull of a reckless street code, Dude faces a choice: audition for a local band or chase the adrenaline of the moment.
He chooses the audition, only to discover the group has sold out to bland pop, stripping away the spark that once drew him in. Enraged, he leaves the club and is wounded when Teddy catches up and fires as he flees. Dude hurries home for a shotgun, and the town’s violence erupts as he kills Teddy, sparing Teddy’s girlfriend Julie. As he packs to leave, he says goodbye to Donna and Nixer, while Sarge, learning of Teddy’s death, plots one last move to end the feud. The clash culminates in a brutal car crash caused by Dude shooting out Sarge’s tires, a merciless end that marks his grim, unsettling smile as he drives onward.
