Frozen Planet, about life at the highest of high latitudes, the poles.
It was an hour of saying "wow" and the occasional "effing wow".
Landscapes that make the Lord of the Rings look wimpy, waterfalls dropping a mile through the ice sheet, explosive birth of icebergs out of glaciers, a polar bear hunting for a mate, wolves taking down a bison, whales blasting through bait balls, sea lions surfing under a wave trying (and failing) to catch a penguin, humpbacks leaping from the water, killer whales deliberately making waves to crack ice or knock seal prey into the water then using bubbles as a smoke screen, underwater wood lice the size of dinner plates, ice caves around the volcano Erebus, rock formations carved from 200 mph winds, the Mars like dry valleys ..... the spectacles continued non-stop.
It was narrated by the national living treasure that is David Attenborough (who is a dot somewhere in the picture above).
For those in the UK I hope you are watching. For those outside prepare to be amazed.