Mike kicks off his fifth year in business with the restoration of a rare 1971 International Scout II, before teaming up with his brothers to find a new home for their late father's 1964 Mercury motor.

Avery struggles to save his business while Mike is determined to end the year on a high note. However, old secrets and conflicts with Connor get in his way.

A Rust Valley road trip steers Mike into the danger zone after Connor gives him an ultimatum: buy another car and Connor will blow up one from the Field of Dreams.

Mike and Avery embark on a cross-country road trip, which is interrupted by an unexpected call from home; JF borrows shop space from Mike to restore a 1955 GMC truck and his relationship with his brother.

Rust Valley's auto shops battle it out at the high-impact Hit to Pass drag race. But when one competitor is accused of cheating, the brawl moves from the track to the pit.

Mike bites off more than he can chew when juggles helping out with a 1938 Buick Special for an employee and finishing a 1965 GMC Handi-van. He and Avery also train for a local dance competition.

Mike restores his very first car, a 1961 Sunbeam. Avery buys an army truck, and recruits Mike to bring it home. Afterwards, tempers flare as the two discuss the bottom line.

Mike restores a 1968 Beaumont for a charity auction, but scrambles to save the build and the fundraiser when his budget is pulled out from under him; Avery steals a Rust Bros client with a German-made Unimog, putting his friendship with Mike at risk.

A visit to Avery's family farm leads to the discovery of unexpected treasures, and puts Mike's veterinary skills to the test. Meanwhile, a new member of the rat rod community needs help rebuilding his dream.

Mike refuses to sell an old clunker to a pair of serious buyers and instead takes on the challenging restoration of a 1967 Mercury Cougar with a tragic past; Avery goes head to head with Mike at the local swap meet.

Mike struggles to finish the restoration of a legendary muscle car, and trading gets chaotic when he goes up against The Great White Shark; one of Rust Valley's own heads to The Detroit Autorama with a 1964 Acadian.

Connor enlists the Rust Bros on a personal build, while Avery goes over budget on his dream truck. James tackles a project from his past.

With winter looming and the restoration season ending, Connor goes behind Mike’s back to restore a 1967 Chevy II, while Mike puts an over-the-top engine in a 1964 Ford F100 truck.

An iconic 1969 Road Runner gives Mike a run for his money and a crash course in bodywork; a client build cuts very close to home; while out on a simple errand to buy shelves, Mike manages to make a deal on something for his trusty companion, Lincoln.

Mike gives Cassidy the opportunity to take charge on a restoration; Avery finds pieces of a 1942 Harley Davidson buried among Mike's junk and recruits a local motorcycle legend to help him restore it to its former glory; Mike tries to gold snipe.

Mike takes on the build of a 71 Camaro to honor a friend battling cancer. Avery's first project at his new shop is a paddlewheeler boat.

Old rivalries bring new alliances as Rust Valley's competing shops get ready to face off at the annual Hit-to-Pass race; the cost of Avery's Deuce-and-a-Half music truck spirals out of control.

Mike's restoration of a 1966 Pontiac Parisienne connects him with Rust Valley's most oddball residents, as does a major swap meet, while his son Connor pushes him to help out a friend recovering from tragedy.

Connor's out to avenge the Rust Bros' failure at last year's demolition derby, but gets more than he expected when Avery and Shafin enter a car of their own; Mike restores a 1965 GMC van with an emotional past.

Mike sells a Willys Jeep to custom car wizard James West, but the price will be determined by the winner of a drag race; the challenge puts pressure on both shops to produce competition-worthy trucks.

Rust Valley rivals face off in the Shop Truck Challenge; Mike struggles to restore a 1971 Chevy Blazer for a wedding day surprise; Avery's plan to repurpose a military truck for music festivals hits a sour note.

Mike overhauls a 1955 Belair Wagon in hopes of turning a quick profit, while Avery embarks on an ambitious restoration of a rare 1956 Ford C.O.E. Mike’s betting streak continues.

Mike's brother entrusts him to restore his 1964 Buick Riviera dream car; Mike restores a 1966 Beaumont Sport Deluxe; Mike hires a 17-year-old apprentice who's failed her driver's test and needs her licence to do the job.

Mike risks ruin when he resurrects his costly restoration of a 1968 Camaro; new shop manager Avery sends the budget soaring on a 1966 Super Bee and they discover that thieves may be stealing parts from the Field of Dreams.

Mike restores a 1969 El Camino for his son Connor to race in a high-stakes Hit to Pass competition; Rust Bros' biggest rivalry gets nasty when they realize that not everyone is playing by the rules.