When a big, hairy asteroid clips Bob's beloved Moon, it takes him and his dog, Barry, ages to clear up the itchy dust. Next morning Bob finds the itching is worse, and he has a strange hunger for... meat! Under a microscope all becomes clear - the dust was actually thousands of werefleas, travelling across the galaxy, turning planets and asteroids into hairy, scary, werewolf-infested places with their cursed bite! Can Bob save the Moon from the same fate, especially if he's feeling hair-raisingly unusual himself? Luckily he has Barry to help him, canine-to-canine!