Rookie Sonny faces a 40-car pile-up that turns a major highway into a war zone; in the snow blet, a fierce storm triggers a triple-semi crash; the father-son team at Preferred Towing race to clear the road as weather blasts in.

A semi-truck crash shuts down a crucial border route, putting pressure on lead operator Kevin to reopen the road; rookie heavy rescue driver Sonny helps a trucker stuck on a dangerous stretch of highway; a tanker wreck causes commuter chaos in Toronto.

A courier truck rolls over; Mark finds himself in the middle of a crash zone on the 401 during a storm; and the crew are faced with an icy airbag job.

James and Bubba recover a semi that smashed into a building without bringing down the whole structure; Kevin faces problems with a tractor-trailer that has crashed in deep mud.

Gary's team fights to upright a battered trailer that is dangerously close to splitting open; a rookie takes his first shot as lead operator on the rotator under tough conditions.

Gary's second-in-command Kyle tangles with a wreck that will prove if he's got what it takes to lead the team; Sonny heads to the scene of a violent jackknife where curious drivers are causing further problems.

A whiteout pile-up scatters heavy I-beams across the highway, testing James and his crew; Kevin must lift a 20,000-pound chunk of steel off the road. Herb's crew stares down a huge mess and a marathon recovery in tough condition.

During a spring store, Steve cleans up a fuel spill blocking the 400, while Sonny struggles to keep the alternate route moving; John Allen recovers a loaded semi that went for a wild airborne ride.

Members of the "Highway Thru Hell" crew join the 401 crew to weigh in on the unique challenges of recovery operations in Ontario and B.C.. comparing the biggest wrecks and toughest jobs over the past winter.

Sonny and the team from Steve's Towing fight to remove the wreckage of a dump truck embedded in an overpass on the 401; James Ireland faces a trailer threatening to cave in on his crew.

A freak storm unleashes a 100-car pileup east of Toronto, pushing Steve and Sonny to lead the recovery charge; Kevin fights a tough wreck after a trucker smashes into an orchard.

A massive multiple-semi crash in a tunnel forces the Coxon crew to clear a big mess in a tight space; Mark Haslett heads to the rescue when a woman is trapped on a dangerous stretch of the highway in Toronto.

When a violent windstorm flips a tractor-trailer on an exposed bridge, Kevin works under the most difficult and dangerous conditions of his career; James takes on a wind-battered wreck of his own.

A tragic collision between two semis sends Bear and the crew from Ross into the fray; Nate and Andrew improvise after a load of lumber rolls on the 401, backing up traffic all the way to Quebec.

Sonny hunts for a shortcut across town after a runaway van smashes through a wall and into the path of a full-speed truck; the crew from Herb’s hurries to save a load of pharmaceuticals before it freezes.

Freezing rain scatters Gary's team, forcing him to work solo to open the continent's busiest border crossing; in Windsor, Brad, Eric and crew fear a tragedy when they untangle a sedan badly crushed by a semi.

A storm sweeps across the province, sending heavy rescue crews scrambling; in Hamilton, Kevin fights to clear a wreck in time for the plows to get through.

The pressure is on for Steve when a flipped truck blocks access to the airport; Coxon fights a wreck with a toxic payload; a wild rollover rips a cab off its chassis and leaves a trail of destruction for the Ross crew.

A heavy wreck and a frustrating recovery threaten to overwhelm Kevin; after a big change in his career, Sonny struggles to make a mark when a heavy load flips in the middle of the city.