Auntie Mabel buys a packet of her favourite cheese and onion crisps and decides to find out where potato crisps come from. She and Pippin fly in Spotty Plane to the fields where potatoes are being harvested. Auntie Mabel describes the life cycle of the potato plant and Pippin helps to dig them up. They see the potatoes being sorted and then travel to the Golden Wonder crisp factory. Auntie Mabel watches the potatoes being washed, sliced and cooked. She sees how the flavour is added and the crisps are sealed in air-tight packets ready to be sold in the shops.