Chemistry Set

Chemistry Set is the fourth episode of Series 2.

Summary
Norman's dream of making the pongiest stink bomb in the world backfires when Dilys walks into the laboratory.

Characters

 * Fireman Sam
 * Elvis Cridlington
 * Station Officer Steele
 * Sarah and James
 * Dilys Price
 * Norman Price
 * Trevor Evans
 * Bella Lasagne
 * Morgan (mentioned)

Vehicles

 * Jupiter
 * Trevor's Bus

Locations

 * Pontypandy Fire Station
 * Dilys General Store
 * Bella's Cafe
 * Newtown (mentioned)

Trivia

 * Stock footage from Flat Tyre is used.
 * The Welsh title is called, "The Scientist".