S04E07Doctor Who season 4 episode 7: The Unicorn and the Wasp
Aired 17 May 200847 minRated TV-PG
Where to watch Doctor Who Season 4 in Australia
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Availability checked 16 November 2026.
What happens in “The Unicorn and the Wasp”
The Doctor and Donna's meet Agatha Christie at a manor owned buy Lady Eddison. When Agatha Christie goes missing and a body turns up in the library the adventure turns into a pulp sci-fiction murder mystery, with a murder, a jewel thief, and a wasp alien. Can they solve the mystery?
Episode summary: TMDB.
Before you watch
- It is episode 7 of 13 of season 4, so watch episodes 1 to 6 first.
- It runs about 47 minutes.
- Directed by Graeme Harper, written by Gareth Roberts.
- TMDB users rate it 7.0 out of 10 (76 votes).
Doctor Who trailer
The official trailer for the series (no preview of this episode has been published).
Play video: Doctor Who trailer
Cast and crew of this episode
- Director
- Graeme Harper
- Writer
- Gareth Roberts
- Guest stars
- Ian Barritt as Professor PeachFenella Woolgar as Agatha ChristieDavid Quilter as GreevesChristopher Benjamin as Colonel HughFelicity Jones as Robina RedmondCharlotte Eaton as Mrs HartTom Goodman-Hill as Reverend GolightlyLeena Dhingra as Miss Chandrakala
Credits: TMDB.
More from Doctor Who Season 4
Every episode of Season 4Doctor Who episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.