Series looking at cult sci-fi series. Daleks creator Terry Nation sold his idea for Blake's Seven as 'Robin Hood in space', and his collection of inter-galactic outlaws running from the corrupt Terran Foundation drew audiences of 10 million at the time and continues to have a devoted following today. This programme reveals that Servalan underwent a sex change, how Blue Peter got the Blake's 7 model department out of a fix, and why the eponymous hero left the series at the end of series two.