| Episode Number | 21 |
| TV Release Date | 1 April 1991 |
"Build a Better Mousetrap" is the twenty-first 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 15 February 1964. The episode was directed by Peter Hammond and written by Brian Clemens.
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