Featuring stories of remarkable strength and fearless dedication, the series chronicles the lives of heroic rescue teams who often put their own lives at risk to help keep vital transport highways open and communities safe. Dropping everything to respond, it is their duty to remove the often-dangerous cargo, clean up the twisted metal, clear the road, and get traffic rolling again for thousands of drivers.

Discovery's smash-hit original Canadian series returns for another epic season, with 17 all-new episodes following the hardworking and heroic heavy recovery operators who fight to keep the roads open through British Columbia's Coquihalla and Cascade mountains. This season, Jamie Davis continues to lean on his classic collection of "old iron" to tackle some of the toughest recoveries, but his crew is buzzing with excitement at the prospect of something shiny and new coming to the yard. Change is also in the air for lead-operator Colin Mclean, when developments in his personal life lead him to question his future in the tow business. Then, 100 kilometers north of Hope, B.C., Reliable Towing's resilience is tested like never before when one of their own is caught up in a terrifying event on the highway. Quiring Towing's Al Quiring and Gord Boyd tackle some of the heaviest off-road jobs imaginable, while down in the Fraser Valley at Aggressive Towing, Jamie's brother Jason and his top man Chris ‘Merv' Mervyn's modern rotators are in high demand. Just down the road, 63-year-old heavy rescue legend Ken Duperon continues to lead Mission Towing, but when he's struck down by an urgent medical crisis, his son-in-law and lead-driver Dylan Greenwood must step up. HIGHWAY THRU HELL marks its milestone 100th episode this season, before just-announced Season 9 begins production.

Jamie Davis is shifting gears once again. After years of keeping the highways open with some of the most modern heavy wreckers – the legendary tow man is staking his future on old iron equipment.

At Davis' yard in Hope, B.C., Classic Holmes tow trucks – some nearly half a century old – are slowly replacing newer, costlier wreckers. For Davis, the vintage trucks are more than just a passion – they represent survival. Under pressure to reduce costs and stay competitive, Davis is confident this winter he and his crew can tackle some of the toughest jobs – on and off the Coquihalla Highway – using an aging, rebuilt fleet.

This winter season, Davis is counting on one truck more than any other – the "Mighty Mo". After rolling out of his garage at the end of last winter, the beautifully restored Holmes 850, named after a World War II battleship, is ready for war. Known as the most powerful tow truck of its day, the hulking 40-ton wrecker will need to shoulder the biggest jobs as Davis prepares to sell his last modern truck.

After a challenging first winter working the mountain passes, former prairie operator Colin McLean is back in Hope for more adventures as Davis' lead driver. But having run some of the best top-of-the-line hydraulic trucks, Davis' "old iron" is going to take some getting used to.

Each one-hour episode follows the Jamie Davis Motor Truck team as well as their competitors – Quiring Towing, Mission Towing, Aggressive Towing, and Reliable Towing – as they brave the harsh conditions of the Coquihalla Highway. Ready to navigate extreme roads and weather, each team prepares to put themselves on the line in order to keep some of the most economically important and travelled trucking routes in North America open and accessible for all.

Before the beginning of the winter season, Jamie Davis thought he had seen it all in Hope, B.C. Working one of the harshest mountain highways in North America, Davis' heavy rescue team usually knows what to anticipate – but this time, record-breaking snowfall, ice, wind, and bitter cold make Mother Nature their greatest enemy. After closing his operation in Alberta last year, Davis is still focused on improving his towing business in Hope, and that means getting the most out of his team and his trucks. And this winter, Davis is counting on one man more than anyone – Colin McLean. After saying goodbye to the elite team last season, McLean makes a surprise return to the company.

Davis is counting on family more than ever in Season 6. His son, James Jr., and his stepson Brandon become more involved with the family business, while Davis' brother Kelly continues to help out in Hope, B.C. Often a thorn in Davis' side, Kelly still proves he's worth keeping around as a heavy rescue operator. Equally handy with a welding torch as he is helping out on a wreck, Davis' cousin Paris joins the crew as the newest addition to the business.