Woffles is a dog and Stretch is a cat. One day, this contented pair have a new addition to their family. A big ball of black fluff in the form of a very naughty kitten - Muffy - who holds up her claws with her nails sticking out so they look like pins on a pin cushion. And Muffy decides to play tricks on Woffles and mayhem ensues. It's up to Stretch to restore harmony to the household . He does so by introducing Muffy to a monster - her own reflection in a long mirror in the upstairs bedroom.