In Texas, a man stumbles across a news report about a dangerous new designer drug known as Crystal Dream, which is highly addictive and is applied by rubbing small amounts into the eyes. Leaving behind a woman he had been living with, he embarks on a journey across the American Southwest, steering clear of major highways and sticking to a route that parallels the Mexican border. Upon reaching Los Angeles, he stops at a gas station convenience store for cigarettes, only to find the place being robbed. Unfazed, he attempts to complete his purchase, but when a robber threatens him, he swiftly disarms and physically takes down the thug and his accomplices with ease. When asked by the cashier for his name, he casually replies, “Harley Davidson,” before departing the store with a stolen Desert Eagle pistol.
Later, Harley makes his way to a bar where he finds his best friend, The Marlboro Man, engaged in an intense pool game against a large opponent. Following Marlboro’s victory, a conflict erupts when the vanquished contender accuses him of cheating. Once the dust settles, Harley and Marlboro return to their old watering hole, the Rock N' Roll Bar & Grille, only to discover that Burbank has transformed into a sprawling international airport. Inside, they reconnect with old friends still running scams, including their towering buddy, Jack Daniels, who’s been taking falls in arm-wrestling matches to make enough cash to help the bar's aging proprietor, known simply as "Old Man." Despite being still in command, the bar faces foreclosure from the Great Trust Bank, which intends to erect a skyscraper on the property.
As they reminisce, tensions flare when Jack learns of Harley’s past affair with his now-wife, Lulu, a singer at the bar. In their quest to save the beloved establishment, Harley and Marlboro rally their friends to execute a heist on the Great Trust armored car for the necessary funds.
The following day, the crew skillfully orchestrates a series of construction detours, leading the armored vehicle to a secluded street. Here, they overpower the drivers and cash in on numerous bags they load into a waiting pickup truck concealed within a sewer line. As they make their escape, they are warned they are in deep trouble, just moments before a black limousine pulls up. Out steps a team of assassins clad in leather, who unleash a torrential wave of gunfire. Undeterred, Jack rides in on his motorcycle, igniting a trail of gasoline leading to them, but the assailants evade the explosion and continue their pursuit. The gang narrowly manages to escape with their haul, only to discover that the bags are filled with the Crystal Dream narcotic rather than cash.
The leader of the assassins, Alexander, meets with Chance Wilder, the CEO of the Great Trust Bank, who expresses anger at the theft of his product and orders Alexander to track down the thieves and retrieve the drugs. That evening, after a reckless night of driving leads to a run-in with a motorcycle cop—who turns out to be his former lover Virginia—Marlboro spends an audacious night with her, but discovers she is engaged. Meanwhile, Harley joins Virginia for breakfast, where they discuss the perils of Crystal Dream; she warns him of its addictive nature and dire consequences.
Back at Virginia’s place, Marlboro spends his time fuming over her engagement and decides to steal her fiancé’s Harley-Davidson motorcycle. Determined, Harley and Marlboro confront Wilder over the phone, demanding $2.5 million for the narcotics they pilfered, plus an additional dollar for their running bet. Wilder agrees to meet them that night in an airplane graveyard for the exchange. The swap goes smoothly until Alexander and his crew turn the tables on them, leading to an ambush.
As chaos ensues, they take refuge in the bar’s back room, only to be attacked by Alexander's crew. The duo barely escapes the ensuing carnage, with their allies being gunned down. In a bid to evade Alexander and his men, they flee to a nearby airport, hide in a cargo plane’s baggage compartment, but later find themselves cornered in Las Vegas. There, they check into a lavish hotel, only for Alexander to track them down. They make an audacious leap from the hotel rooftop into the pool below, all while discovering that their pursuer installed a tracking device hidden within Alexander’s coin.
In an attempt to reconnect, Marlboro abandons Harley after a heartfelt exchange about honoring their deceased friends. Harley ultimately decides to stick together, reactivating the tracker for Alexander to follow back to the graveyard. Alexander manages to corner them, initiating a fierce gunfight, where Marlboro showcases his skill by dispatching several of Alexander's henchmen. However, when captured, Marlboro is held at gunpoint by Alexander. In a moment of fate, Harley unintentionally hits Marlboro while aiming at the antagonist, but ultimately finds the courage to shoot and kill Alexander.
They confront Wilder in his office, demanding the return of the stolen funds and insisting he amend the lease for the Old Man's bar. Following a tense standoff—featuring a helicopter attack on Wilder's men—the bar’s fate hangs in the balance. After a fierce showdown, Marlboro and Harley walk away. The duo parts ways at a rodeo, where Marlboro rides a bull, while Harley drives away with a stunning hitchhiker by his side, ready for their next adventure.
