MOTORTREND HD

The Josh Carmon vs. Bryce Sparks rivalry heats up as they line up for the final event of the fall mud circuit; AJ debuts the largest ATV in the world just in time to face Larry Oakes and Megan Rion in the season's nastiest bounty hole.

The Monkeys race to finish their first big build without Aaron; Richard tries to unload his '65 Shelby Mustang GT with a frozen engine.

Richard brings in Gas Monkey's first guest builder; Dallas hot-rodder Brian Bass teams up with the Monkeys to build a '60s style hot-rod out of a '34 Ford Coupe.

Bryce looks to defend his title against his nemesis, Josh; things quickly get out of hand, ending with a broken rig and a bruised ego.

At Arkansas's Greasy Bend Off-Road Park, rivals Bryce and Josh wager big money on the small tire bounty course; Larry calls up an old friend to help him turn his season around; AJ does whatever it takes to take down his top competition.

Larry and Bobby enter a wild trail race, using questionable tactics while chasing their first win; Bryce dresses to impress and risks it all on the ATV short course; Randi takes on Megan Rion and skimmer A.J. Robinson in the Bounty Hole races.

Tory, Bisi and Faye test a myth from a popular movie franchise that claims you can increase boost and win a Cuban mile drag race from a turbo charged engine with just a length of wire and soda can tab.

The team tests whether adding a turbo to a hybrid makes it more fuel efficient.

Freiburger and Dulcich enlist the fabrication skills of Dave Chappelle to start building the Dragoneer; the LS-powered 1970 Jeep Wagoneer needs a lot of work, but it's on its way to becoming a quick street/strip sleeper.

Freiburger and Finnegan drive the mid-engined, GMC Crew Cab, road-going dragster 500 miles to the Roadkill Zip-Tie Drags at Tucson Dragway.

Robby wants to convert Dan's 1926 Ford Model T into a far more rare 1914 C-cab; a man's 1969 Chevrolet Camaro convertible is an accident waiting to happen.

A modified 1965 Chevrolet Impala looks cool but is impossible to drive; a 1967 Corvette arrives with a massive list of repairs that needs to be done.

Andy sees dollar signs when he comes across a rusty Trans AM at an auction, but getting the vehicle running is another matter.

Andy jumps at the opportunity to purchase a 1967 Chevrolet Camaro pace car, but the rare, valuable classic is currently in pieces.

A '57 Chevy looks great, but the guys discover that looks can be deceiving.

Joe Martin puts the finishing touches on the 1957 Chevrolet Bel Air and arranges for the car to be delivered to the owner; Joe uses all his tricks to prepare a Chevrolet C10 for a charity auction with a stylish paint job.

It's beginning to look a lot like Christmas as Joe and his crew tackle a unique request: turn a salvaged red '51 Chevy 3100 pickup into a roadworthy, Christmas-parade spectacle; Joe devises a plan for bigger power, an updated suspension and more.

Custom car guru Joe Martin and his team at Martin Bros. Customs put the final touches on a red 1951 Chevy 3100 pickup, transforming it a Christmas parade truck.

Joe dusts off his prized '65 Pontiac Catalina to give it the facelift it deserves; new brakes, new trick frame and a bigger, badder LSA 600 horsepower motor; Martin Bros. Customs tricks out the interior on a 1932 Ford Roadster.

With updates well underway on custom car guru Joe Martin's prized '65 Pontiac Catalina, Joe and the boys at Martin Bros. Customs give the ol' choppy-doo to a '41 DeSoto that has seen better days.

A longtime customer has his eye set on a car from Joe's personal collection, a 1967 Nova; Joe counters by offering up a 1966 Nova, with the guarantee that it will be twice the car Joe's is; big brakes, big power, big wheels and more.

Joe pulls out all the stops to make the '66 Nova the car of his client's dreams; Joe doesn't just want a mean motor and big tires; he wants a chopped roof, but the car might be too far behind schedule for a chop, even if it does up the cool factor.

A customer from New York entrusts Martin Bros. with his prized 1965 Buick Riviera; Joe wants to update the car with crisp body lines, a trick paint job, a 525-horsepower LS3 and more.

Joe and the crew button up the 1965 Riviera's wiring, interior and paint before the owner arrives from New York to reclaim his car; with the finish line in sight, a wrench gets thrown in their plans when the paint job needs to be taken out of house.

Joe pulls out all the stops to make the '66 Nova the car of his client's dreams; Joe doesn't just want a mean motor and big tires; he wants a chopped roof, but the car might be too far behind schedule for a chop, even if it does up the cool factor.