Like every year young Rupert is staying with his terrible grandmother Porfilia for Christmas. She leaves him home alone with the task of finding the tip for the Christmas tree that should be in the garret. There he finds something much more interesting, an old trunk containing the inventions of Rufus, the genial ex lodger of the garret. One of the strange objects he finds is a lamp, he clicks it on, and it starts sending hostile messages into the space reaching an alien ship floating nearby the earth. Unaware Rupert receives a packet from the sky. Must be Santa who sent it! He opens the box full of hope but instead of a gift he finds a bunch of small, aggressive aliens ready to conquer his house…