Set in Cartersville, Ohio, in 1998, the story begins with a young Graham Harvey as Sean Walker, who spends his time hanging out with his best friend Ted and their tight-knit circle of friends. This group, consisting of Reagan Marum as Aimee, Aiden Stoxx as Crosby, and Charmaine, calls themselves “The Matchbox Gang” due to their intense obsession with collecting and playing with Matchbox cars. Under the watchful eye of Aimee’s uncle, Bill Camp as Cal Smalley, the kids bond over their hobby at Smalley’s Garage. Sean harbors a deep crush on Aimee and desperately wants to gift her a 1969 blue Camaro Matchbox car—her absolute favorite—but in a moment of hesitation, he chickens out, a regret that lingers for years.
Fast forward nearly thirty years, and Sean, now played by John Cena, has led a life far removed from the quiet streets of Ohio. He is now a high-level CIA agent. During a high-stakes operation in the Sahara Desert, Sean is led by his handler Helen, played by Danai Gurira. The mission culminates in a chaotic, adrenaline-pumping car chase to secure a dangerous nuclear warhead and keep it out of the hands of enemy forces. Once the objective is achieved, Helen instructs Sean to go off the grid and lay low for ten days.
Meanwhile, back in Ohio, the former members of the Matchbox Gang have drifted apart, consumed by the complexities of adulthood. Aimee, now portrayed by Jessica Biel, works as an EMT but secretly dreams of becoming a professional racer. Ted, now Arturo Castro, is a chemistry teacher and a father of three, though he struggles to engage his disinterested students. Crosby, played by Sam Richardson, works in construction and is married to Charmaine, portrayed by Teyonah Parris, who serves as a helicopter pilot for a news station. The group is brought back together by tragedy when Aimee discovers that Uncle Smalley has passed away in his office.
The friends reunite for a somber funeral, honoring Smalley by placing Matchbox cars on his coffin. Sean, who has been hiding in the shadows during the service, eventually visits the garage where he is spotted by Aimee. She invites him to join the gang for drinks, and while the reunion starts warmly, it takes a sudden, sinister turn. As they begin to lose consciousness, Sean’s training kicks in. He realizes they are being drugged and warns his friends that they are about to wake up in a completely different location.
They awaken to find themselves on a plane high in the atmosphere. Director Mosier, played by Corey Stoll, confronts Sean, accusing him of stealing the nuclear warhead for his own gain after a deal went south. Maintaining his innocence, Sean engages in a brutal fight with Mosier and his mercenaries, eventually knocking them unconscious and ejecting them from the aircraft—though he ensures they have parachutes. After revealing his true identity as a spy to his shocked friends, Sean manages to land the plane in the water, and the group makes their way to a nearby island.
The situation worsens when Ted is injured. Despite Sean's warnings to stay hidden, the group takes Ted to a hospital. It is here that Sean discovers a devastating betrayal: Helen, Danai Gurira, is actually the one who stole the warhead. She is working alongside a dangerous henchman named Falko, played by Daniel Bernhardt. A frantic escape ensues, with the group outrunning gunmen through the city streets. In a moment of ingenuity, Ted utilizes his chemistry knowledge to craft a makeshift explosive to fend off their pursuers.
Now branded as FBI fugitives, the group hides out while Sean opens up to Aimee. He explains that he and Helen were recruited by the CIA at the same time and were once close friends before her true nature was revealed. He expresses his deep regret for involving his friends in this nightmare and admits how lonely his life has been. Moved by his honesty, Aimee convinces the rest of the gang to help Sean retrieve the warhead to clear their names. With the help of an ally named Grigor, they fly to Bucharest.
In Romania, the gang dons party outfits to blend in and meet Robbie, played by Golshifteh Farahani, a contact of Sean’s with whom he shares a romantic history. To protect his friends, Sean pretends to be disgusted by their presence, making it seem like their reunion was a mistake. However, Helen and Falko arrive, and in the ensuing chaos, Sean is knocked out by Falko and abducted. Despite the danger, the group refuses to leave him behind. Ted reminds them of Sean's loyalty during their childhood, specifically how Sean supported him during a very dark period of his life. Inspired, the group follows Robbie to her garage to gear up for a rescue mission.
The rescue is a high-octane assault: Aimee takes the wheel of a fast car, Ted rides a motorcycle, Charmaine pilots a chopper, and Crosby drives a massive truck. Meanwhile, Helen reveals her master plan to Sean: she intends to use the warhead to seize power and frame Sean for the theft, planning for him to perish in the blast. Just as things look bleak, the Matchbox Gang arrives. Charmaine rains missiles down on the enemy from her chopper, while Ted uses a shotgun to attack Falko’s truck. Though Charmaine’s helicopter is shot down, she survives and continues the fight in a van. In a violent clash, Falko is thrown from his vehicle and killed by a grenade. Aimee eliminates a gunman with a daring driving maneuver, and although Helen rams Sean’s truck off a bridge, Sean survives and reunites with his friends.
The climax takes place in Budapest, where Helen prepares to detonate the bomb amidst a crowd of protesters. The Matchbox Gang coordinates a plan to defuse the device. Sean engages in a final, desperate struggle with Helen on top of a bridge and inside her chopper. After a fierce fight for the detonator, the pilot is shot, and Sean manages to grab the device before leaping into the water. Helen, however, remains trapped in her seat as the helicopter crashes in a massive explosion. The timer on the bomb stops; Sean has successfully defused it.
In the aftermath, Director Corey Stoll as Mosier returns. Once the warhead is recovered, he agrees to clear the records of everyone involved. Sean says a bittersweet goodbye to his friends once again.
Some time later, Crosby and Charmaine host a party as they prepare for a new chapter in their lives. While outside, Aimee discovers a small Matchbox blue Camaro—the same car Sean had wanted to give her decades ago. She looks up to find Sean standing there with the real, full-sized version of the car. The two finally share a long-awaited kiss and drive off into the sunset, watched over by the proud members of the Matchbox Gang.
