| Series: | The Avengers |
| Season: | 3 |
| Episode: | 4 |
| Production: | 3602[1] |
| Director: | Raymond Menmuir |
| Music: | John Dankworth (theme) |
| Guests: |
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| Episode List: | List of The Avengers episodes |
| Prev: | Man with Two Shadows |
| Next: | Death of a Batman |
"The Nutshell" is the fourth episode of the third series of the 1960s cult British spy-fi television series The Avengers, starring Patrick Macnee and Honor Blackman. It was first broadcast by ABC on 19 October 1963. The episode was directed by Raymond Menmuir.[2]
Steed and Cathy investigate espionage by a pretty burglar in "The Nutshell", codename for a top-secret underground nuclear shelter.[3] They are not telling each other everything, and somewhere a traitor lurks.