On a lovely spring morning in Cambridge, ten year old Louis discovers a trio of small talking creatures in the back garden. They are peaceful and friendly, but Denver the labrador is particularly curious and coming too close he instantly vanishes inside the aliens' portal. Louis goes after him and soon finds himself travelling through a wormhole in space to the other side of the universe. He arrives in a world of wonder such as never been seen before. The skies, lands and seas are picturesque and dreamy in glorious colours. But the Kingdom of Spalenia, where the aliens live, is under threat...