The fourth installment of the series brings back the original cast as they take on a Mexican heroin dealer. Dominic Toretto (Vin Diesel) is reintroduced down in the Dominican Republic stealing oil with Lettie (Michelle Rodriguez) and Han (Sung Kang) in a spectacular explosive scene. Brian O'Conner (Paul Walker) has rejoined the FBI, solving street-racing crimes and heroin smuggling. When Letty winds up murdered, Dom returns to Los Angeles and seeks revenge. Dom beats up mechanics and O'Conner tracks his mayhem. When Ramon Campos (John Ortiz) hosts a race to interview new drivers to work for the mysterious drug dealer Arturo Braga, both Brian and Dom enter. Dom beats Brian to earn the job working for Braga. This chase looks great as the special effects are updated. Gisele (Gal Gadot) also works for Braga and finds Dom attractive. Brian also sparks anew his relationship with Mia (Jordana Brewster) though she is still bitter about him lying to her in the original film.
Brian has another one of Campos's racers arrested so that he can join the other drivers transporting cargo. They are shipped across the border, given coordinates, and told to follow Fenix (Laz Alonso). They speed down into a tunnel beneath the Mexico- American border. Dom plays his hand, reveals he is on this mission for revenge and blows up all the racecars. Dom and Brian escape with Campos's supply of heroin, but then Dom becomes pissed when he finds out Letty was working undercover for Brian, who is only able to stop Dom from beating him up when he reveals that she was doing it to gain Dom's freedom.
Brian pitches a plan to use the stolen heroin to lure out Braga through Campos and trap him in a sting. Using an identification tool, Agent Trinh (Liza Lapira) learns that Campos is, in fact, Braga. The FBI is angered by the mixup and remove Brian from the case, but still set on revenge, Dom and Brian make it down to Mexico and find Braga's lair with the help of Gisele. Bragas hides out in a church preparing for Dom's attack. Brian and Dom capture Braga and race back to the border to put him in prison. This arrest sparks the final chase scene of the film.
The final car chase through the mountains and desert leads back to the underground tunnel across the border. Dom is set on catching Fenix for the murder of Letty, while Brian takes Braga. The motor mayhem grows pretty intense as Brian ends up with his car flipped and about to be murdered by Fenix. Dom fends off Braga's other henchmen even jumping out of his own car into another. This chase really amped up the possibilities of a Fast & Furious chase scene. Just as Fenix is about to take out Brian, Dom flies out and runs him over.
Dom stays with Brian and ends up being arrested. Despite Brian's promise of pardons, Dom is given the maximum sentence of 25 to life. However, as he is on the bus to prison, fast cars pull up. Brian is back on the other side of the law breaking Dom out. Justin Lin directed this one after Tokyo Drift and leads to a great action film director career that is still going strong. This addition to the series brought back the original cast and sparked the new wave of Fast and Furious films that would go on to become a global box office behemoth.