Eggy Breath

Dr Mu has travelled to the Planet Flotsam, a junk asteroid made entirely from rubbish collected from the distant corners of the multiverse. From his orbit above the asteroid, Dr Mu is extracting the Grot Particle, the source of all bad smells, and beaming it down to Earth, where it is polluting the atmosphere and spreading like a virus, giving the whole population bad breath.

Can Rufus stop Dr Mu before the epidemic of eggy breath reaches toxic levels and the whole planet has to be evacuated?