Monster Munch was launched in Britain in 1977 by Smiths. Originally called "The Prime Monster" (a play on "The Prime Minister", and as part of a wider campaign), the decision was taken to rename the snack "Monster Munch" in 1978. Advertised as "The Biggest Snack Pennies Can Buy" – in reference to the large size of the crisps – each pack featured a different monster on the front of the packet.

Now made by Walkers -

Monster Munch was available in a variety of flavours over the years including Roast Beef, Pickled Onion, Saucy Tomato, Bacon, Cheese & Onion, King Prawn and Salt & Vinegar. Pickled Onion has remained in the selection throughout the years, with Roast Beef appearing in almost every combination. By the 1990s the four main flavours available were Pickled Onion, Roast Beef, Smokey Bacon and Flamin' Hot.

The shape known as a "monster paw" that is still used today is actually based on the single eye of the yellow monster.