Frozen Planet is a 2011 British nature documentary series, co-produced by the BBC and The Open University. It was filmed by the BBC Natural History Unit. The production team, which includes executive producer Alastair Fothergill and series producer Vanessa Berlowitz, were previously responsible for the award-winning series The Blue Planet (2001) and Planet Earth (2006), and Frozen Planet is billed as a sequel of sorts. David Attenborough returns as narrator. It is distributed under licence by the BBC in other countries, Discovery Channel for North America, ZDF for Germany, Antena 3 for Spain and Skai TV for Greece.