The first ever broadcast dramatisation of Ursula Le Guin's seminal science fiction novel. On an alien world in the middle of an Ice Age, one man prepares for the biggest mission of his life. Alone and unarmed, Genly Ai has been sent from Earth to persuade the people of Gethen to join the Ekumen, a union of planets. But it's a task fraught with danger. Genly is shocking to the natives, for Gethen is a world in which humans are ambigendered - everyone...