When Mum and Dad realise they've forgotten to buy the tree for their annual Robinson Christmas tree decorating party, helpful elves Biff, Chip and friends decide to oversee preparations while Mum and Dad pop out to get one. But not everything goes to plan, and soon Gran's mega mince pie has got burnt, and Floppy has managed to ruin the decorations. Then when Mum and Dad finally return with the world's worst tree, and the house is thrown into darkness thanks to a power cut, it seems like the party is well and truly ruined. Luckily for everybody, the elves have one last special Christmas surprise up their sleeves.