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Chemistry Set
Norman's dream of making the pongiest stink bomb in the world backfires when Dilys walks into the laboratory.
![](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![](https://image.tmdb.org/t/p/w300/hlNHkpf1T1pW7SePvZysBqtm48R.jpg)
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Other episodes for this season
![Treasure Hunt](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Sam's Day Off](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Thief in Pontypandy](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Chemistry Set](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![The Wishing Well](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![The Great Inventor](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Safe With Sam](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Snow Business](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Episode 9](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Episode 16](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Episode 17](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
![Episode 19](https://image.tmdb.org/t/p/w300/sBpH8RD1bdsc6TAkKU5rNR03zqT.jpg)
Norman's dream of making the pongiest stink bomb in the world backfires when Dilys walks into the laboratory.