Episode Title: The Unicorn and the Wasp

Duration: 44 minutes and 43 seconds

Written by: Gareth Roberts

Directed by: Graeme Harper

Transmission Date: 17th May 2008

Ratings: 8.4 million

Synopsis: In 1926, Agatha Christie disappeared for 10 days. Was it amnesia? A nervous breakdown? Or a Giant Alien Wasp..? As Russell T Davies's Bafta Award-winning time-travelling drama continues, the Doctor and Donna join forces with the world's most famous crime novelist to encounter a body in the library, poisoned cocktails and a Vespiform seeking revenge.

Cast List: The Doctor - David Tennant
Donna Noble - Catherine Tate
Agatha Christie - Fenella Woolgar
Lady Clemency Eddison - Felicity Kendal
Reverend Golightly - Tom Goodman Hill
Colonel Hugh Curbishley - Christopher Benjamin
Robina Redmond - Felicity Jones
The Hon. Roger Curbishley - Adam Rayner
Greeves - David Quilter
Davenport - Daniel King
Professor Peach - Ian Barritt
Miss Chandrakala - Leena Dhingra
Mrs Hart - Charlotte Eaton