The Unicorn and the Wasp [SEP] series
The Unicorn and the Wasp
"The Unicorn and the Wasp" is the seventh episode of the fourth series of the revived British science fiction television series "Doctor Who", which was aired by BBC One on 17 May 2008 at 19:00. 
Set in an English manor house in 1926, shortly before the disappearance of crime fiction novelist Agatha Christie (played in the episode by Fenella Woolgar) the episode is a murder-mystery storyline where a shapeshifting giant wasp, in disguise as one of the party guests, murders
", and Keith Temple, who had written episodes of "Byker Grove" and "Casualty". Previous writers Gareth Roberts, Stephen Greenhorn, Helen Raynor and Steven Moffat all contributed to the series, with Russell T Davies continuing to act as head writer and executive producer. Tom MacRae had written an episode for this series, entitled "Century House", but this was replaced after Russell T Davies decided that it was too close in tone to Gareth Roberts' "The Unicorn and the Wasp". This was Phil