Somewhere in space, an unstoppable terror lies in wait. The terror is in the form of a giant alien spaceship, which is part of the 'Intergalactic 147' snooker game headed straight for Earth. When Danger Mouse and Penfold discover it, all of a sudden it knocks the Earth forward, colliding it with other planets as if in a game of pool; and just when things can't get any worse, the spaceship wants to put our heroes, London, and the entire Earth into a black hole in which they will never return. Can Danger Mouse and Penfold find a way to stop the aliens and the spaceship from reaching their goal? Or will our heroes and their home planet be sucked in and destroyed along with their London town with no way out?