Grandpa Pig has a big surprise for Peppa and George. He has built them a beautiful tree house in his garden, with cute little curtains on the window. Peppa loves being in the tree house and invites everyone else to come inside. But before they enter they must take off their muddy boots and say the secret password, which is "Daddy's Big Tummy". Everyone thinks this is very funny, except Daddy Pig.
Stars: Lily Snowden-Fine, David Graham, Frances White