Norman the Slug Who Saved Christmas

When a sack of presents lands - THWACK - right by Norman's stocking he is overcome with excitement. He really must have been a very good slug this year. But after a frenzy of unwrapping he spots a label - and realises that none of the presents were meant for him, but had in fact fallen off Father Christmas's sleigh. Norman knows he has to get the presents to the family they're meant for - but how can he manage it on time? Can one little slug save Christmas?