For the animals of the polar regions, time is running out in the autumn as the Arctic Ocean freezes over and the sea ice advances around Antarctica. Hordes of polar bears gather on the Arctic coast waiting for the return of the ice. Beluga whales head to an estuary to thrash their bodies against the gravel and exfoliate in a gigantic whale spa! Inland, the tundra dramatically transforms from green to fiery red and musk ox fight to defend their harems. In Antarctica, newly feathered Adélie penguin chicks take their first reluctant swim in dangerous waters. A leopard seal explodes from the sea and pulls one from an ice floe in a hunting manoeuvre that has never been filmed before. Missed the latest series of Who Do You Think You Are? US? You can see Steve Buscemi get more familiar with himself at 11.15pm.