The Unicorn and the Wasp

194 – "The Unicorn and the Wasp"
194 – "The Unicorn and the Wasp"
Doctor Who episode
Cast
	Doctor David Tennant – Tenth Doctor;
	Companion Catherine Tate – Donna Noble;
	Others Fenella Woolgar – Agatha Christie; Felicity Kendal – Lady Eddison; Tom Goodman-Hill – Reverend Golightly; Christopher Benjamin – Colonel Hugh; Felicity Jones – Robina Redmond; Adam Rayner – Roger Curbishley; David Quilter – Greeves; Daniel King – Davenport; Ian Barritt – Professor Peach; Leena Dhingra – Miss Chandrakala; Charlotte Eaton – Mrs Hart; Alexander McDonald – Footman (uncredited);
Production
Directed by	Graeme Harper
Written by	Gareth Roberts
Produced by	Susie Liggat
Executive producer(s)	Russell T Davies; Julie Gardner; Phil Collinson;
Music by	Murray Gold
Production code	4.7
Series	Series 4
Running time	45 minutes
First broadcast	17 May 2008
Chronology
← Preceded by; "The Doctor's Daughter"	Followed by →; "Silence in the Library"

"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 on BBC One on 17 May 2008.

Set in an English manor house in 1926, shortly before the disappearance of crime fiction novelist Agatha Christie, the episode is a murder-mystery storyline where a shapeshifting giant wasp, in disguise as one of the party guests, murders the other guests using methods similar to those in the novels of Christie, who is also a guest.