For the past two months many of us have been transfixed by the high-rating Frozen Planet. The BBC-Discovery Channel co-production has gone to the icy ends of the Earth to film what - and who - lives there, and to look at the effects of climate change.
Now it's the show 'n' tell episode. Yes, there has been a spot of bother about the series with British newspapers screeching about the authenticity of scenes of the birth of a polar bear - the cub emerged into the world in captivity, not the wild.
And there was more controversy when the Discovery Channel initially held back the final global warming episode On Thin Ice in the series for its United States broadcast, fearing it would provoke the nation's climate-change skeptics.
But Frozen Planet remains a remarkable series, the equal of its epic BBC natural history forbears The Blue Planet (2001) and Planet Earth (2006).
If its tireless presenter Sir David Attenborough was thinking it was time to retire - he's 85 now, 84 when he went to the North then South Poles making him the oldest man to ever visit both places - then Frozen Planet would be a triumphant note on which to go out.