It is 2020. Findings by environmental scientist Professor Thom Archer suggest that Halo, the corporate energy company drilling on the Greenland Glacier are causing it to melt. Archer's warnings are ignored, so he heads to the Arctic to find indisputable evidence. Upon arrival, he realizes humankind is under immediate threat, and races home to save his family. The glacier collapses, with devastating consequences. Astonishing weather patterns emerge and plunge the world's temperatures into steep decline.

Part 12: British Invasion
Joe and Mikey head off to Coventry, England to navigate the potential purchase of an Electra turboprop to add to BuffaloпїЅs fleet of fire-fighting tanker planes. The father-son duo makes a great team; hard-nosed Joe deals with the business end, while Mikey bonds with the clients during a raucous visit to the local pub. Meanwhile, new dad Rod leads a mission to Manitoba and misses his newborn daughter while away on the job.

Part 13: Arnie Calls It
While training waterbomber captains for the upcoming fire-fighting season, Chief Pilot Arnie makes a surprising decision. AJ becomes a DC-4 captain and ponders whether to accept a promotion. Meanwhile Joe and the whole McBryan family pile into the olпїЅ DC-3 and head to the Super Bowl of aviation пїЅ AirVenture Air Show in Oshkosh, Wisconsin.

Part 8: Ski Plane
Young pilots AJ and Andrew get the chance of a lifetime to fly the magnificent DC-3 specially equipped with skis to land on frozen strips. ItпїЅs up to Chief Pilot Arnie to guide them in the lost art of taking off and landing on skis as they fly to a remote lake and land on the thinning ice. Meanwhile, tension mounts as BuffaloпїЅs contract for the Mackenzie Valley food mail service is up for renewal, and Rod balances tricky personnel issues with preparing for the arrival of his first child.

During construction in Colorado, a bulldozer dug up a tooth so huge it had to be held in two hands. NOVA's Ice Age Death Trap reveals intimate secrets of the life and death of North America's most exotic and extreme creatures. Most tantalizing of all, the team unearths startling and controversial evidence of what may be the earliest humans ever to venture into the untamed wilderness of Ice Age America.

Part 5: The River Lift
A vital ferry link is down, so Buffalo mounts an all-out campaign to airlift 100,000lbs of essential goods across the Mackenzie River. As Devan and Scott shuttle goods nonstop, things really pile up for Jynelle in cargo. Meanwhile, Justin helps an RCMP corporal move to a new community, and expectant parents Rod and Sasha McBryan get the first glimpse of their baby via 3D ultrasound.

Part 6: Dont Muck with Chuck
Crusty mechanic Chuck leads the scramble to ready the Electra for a disaster relief mission in Haiti, but fateпїЅs curveball sends them to the High Arctic instead. As BuffaloпїЅs current crop of rampies struggles to get ahead, former flight attendant Audrey returns to shake up the roster.

A vital ferry link is down, so Buffalo mounts an all-out campaign to airlift 100,000lbs of essential goods across the Mackenzie River. As Devan and Scott shuttle goods nonstop, things really pile up for Jynelle in cargo. Meanwhile, Justin helps an RCMP corporal move to a new community, and expectant parents Rod and Sasha McBryan get the first glimpse of their baby via 3D ultrasound.

Part 1: Frozen Four
As Joe fights a Transport Canada claim against the airline, star pilot Justin is tasked with shipping an 8,000lb generator to a remote town. But a controversial decision results in the DC-4 becoming stranded and frozen solid on a High Arctic airstrip. Now Justin must find a way to thaw the plane and complete the mission пїЅ or face the wrath of an already stressed out boss.

Part 2: Fire and Ice
When a deadly fire destroys a northern outpost a week before Christmas, Buffalo puts everything aside to come to the rescue. Cargo Manager Kelly receives a shocking diagnosis that renews her fight to quit smoking. And new father AJ balances a captainпїЅs life with new responsibilities.