Heavy Rescue: 401

A semi-truck crush shuts down a crucial border route; a tanker wreck causes a commuter chaos in Toronto.

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

A courier truck rolls over; a vicious storm puts Mark in the middle of a crash zone; the crew dives for cover during an icy airbag job.

James and Bubba recover a semi smashed into a building; Kevin faces problems with a tractor-trailer crashed in deep mud.

Gary's team fights to upright a battered trailer; a rookie takes his first shot as lead operator on the rotator.

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 jack-knife.

A whiteout pile-up scatters heavy I-beams across the highway, testing James and his crew.

Steve cleans up a fuel spill blocking the 400; Sonny struggles to keep the alternate route moving.

Members of the Highway Thru Hell crew join the 401 crew to compare the unique challenges of recovery work in their respective environments.