The first programme in this series about the history of British science fiction looks at our relationship with aliens – from Wells' invading Martians to the Daleks, via 2001: A Space Odyssey, the Midwich Cuckoos, and the Mekon – and the genre's preoccupation with the big questions of evolution. Where did we come from? Where are we going? And will we get eaten along the way? Interviewees include the grand old man of British Sci-Fi, Arthur C Clarke along with Brian Aldiss, Doris Lessing and Steve Jones.